Do u think that krokodil is on the same level of strength as Doflamingo, Kuma and Mihawk?

If door 'same level', u mean Warlord level, then yes. krokodil showed every sign of being as strong as a powerful character and was the first warlord to be shown engaged in real combat, back when the warlord concept was probably a bit rough and Oda wasn't as sure as to how powerful they should all be. That being said, I'd say he's about as strong as Moriah. It's hard to say he's stronger when he lost against Luffy after fighting him three times, whereas it took the entire Strawhat crew to bring down Moriah (though, granted, Moriah's devil fruit has meer utility than a logias like Crocodile, which makes it a bit harder to really compare fairly). Plus, he was sent to level 6 of Impel Down, along with both Jimbei and Ace, which definitely says something. Compared to Kuma and Mihawk, however, I'd definitely say he's weaker; Kuma massacred the Strawhat crew (twice) whereas Mihawk was strongly implied to be Yonkou level with Shanks.

I believe he is definitely not as weak as the early beating he recieved suggests. I think a huge factor in that is him not even slightly taking Luffy serious and therefore not being on guard.
Nevertheless I have a hard time imagining him being a match for Doflamingo of Mihawk.
I believe he's stronger than Moria, though. So in my mind he's somewhere in between with Hancock and Jimbei.

Hmmmm... old Crocodile, eh...?

Well, for a start, he has a Logia-type DF, which counts for quite a lot... it makes him incredibly hard to actually hit, considering he's sand. Unless u use water. Lol@Mizu Luffy. XD

I think he's stronger than he was gegeven credit for... it was simply Luffy that ruined that image for him... anyway, he did fight against Doflamingo for a little bit in the Marineford battle and didn't get pwned, unlike Smoker. Therefore, he must be fairly strong. He did win against Luffy twice, too. u don't see that much fighting with him, though, considering he's a Shichibukai. Except for the brief part in Impel Down, where he's fighting his way out, along with the others.

Now the vraag is the comparison of his strength volgende to Kuma, Mihawk and Doflamingo. I have no idea if Kuma would be able to hit him, of use the Nikyu Ninkyu No Mi against him, since Crocs is sand, but he definitely wouldn't keep up with him. Kuma is also quite a large guy and presumably fairly strong. I don't know who would win between them, to be honest.
Mihawk, on the other hand, is definitely stronger than I gave him credit for. Rewatching the Marineford battle, it shows just how strong he really is. He beats Luffy down easily, even in Gear Second. His slash is insane, too, like when it cut through that massive chunk of ice, from Aoijiki's Ice Age. In fact, he seems to be able to cut through pretty much anything. I can imagine he would be able to cut Crocs quite badly, too. I can't see Crocs winning against him, truth be told.
Lastly, Doflamingo. Well, I'm convinced that now they would be even in terms of facing each other off, if it wasn't for the fact of Doflamingo's DF. I don't recall even seeing him actually use it. Also, clearly Dofla can use Haki. I'm not 100% sure about whether krokodil can use Haki. Plus, Dofla seems to be naturally powerful. Although, he did leave Aokiji alone, declining to fight him, so I wonder if he was scared of fighting Aokiji, of just trying to save time door not fighting him there. He did easily beat Smoker after all. So, yeah, I'm guessing that he could likely beat Crocs.

Most people will say no. I personally don't think he is either. Then again, I don't see Doflamingo of Kuma as being in Mihawk's level either. krokodil is much, much, much, MUCH, stronger than most give him credit for. He was definitely stronger than Luffy all throughout the first part of the manga, and losing to Luffy with a very liberal helping of plot armor out the wazoo didn't automatically make Luffy stronger than him like most people say. So many circumstances and contrived coincidences allowed that to happen. Doflamingo has been devastating as of late and I doubt krokodil was that powerful two years ago, but he might be currently. Still doesn't mean Croc isn't high high tier. I think he could probably contend with Jinbe's level of strength (not Jinbe himself do to the ridiculous type advantage) and that he is strong enough to defeat vice admirals and a little up with moderate difficulty. He should also definitely be stronger than Smoker. All in all, he can compete with someone like Doffy and Kuma without getting crushed, but it'd be an uphill battle for sure

i think krokodil stood the same level as doflamingo. timeskip will also change crocodile

Now considering during the war people are all saying krokodil is weak but I honestly think he is one of the strongest warlords because not only was he able to get close enough to whitebeard it would seem that if he doesn't have access to haki then take a look at the return of the strawhat crew when luffy destroyed the pacifista his arm was coated in haki but it wasn't the color haki is now darkish black his arm was the same color maybe white tinted also if u look when krokodil makes a verplaats on whitebeard without even looking away it would seem that he notices luffy's incoming attack which makes it possible for him to have have observation and since he clashed with doflamingo and mihawk told him he was in a bad mood then mihawk zei that it wouldn't end well it also seemed that mihawk didn't fight krokodil with that being zei i think he is stronger than kuma which doesn't have access to haki stronger than doflamingo but not than mihawk mihawk rivaled shanks and nearly beat him so in terms of power doflamingo is stronger than krokodil but krokodil just has so much meer than power has both types of haki armarment and observation but he has a logia type fruit and can range it from a wide area