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My read on villain in this hand was that he was very good

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Ok so, good hands are K's, AK, KQ, KJ?, AQ,AJ, Axs?, mid pair etc 3's?(guess limping is a good play). All of the above except mid pair and 3's are raising hands. He didn't raise, maybe he doesn't raise AK or KJ I don't know, if he has K's and didn't raise on the flop I'd be surprised. If I had top pair with this flop I'd bet because the 23 would make a straight possible. Anyhow, ad5d makes you a 67% favorite that's probably the worst hand you're up against a5o is a 83% underdog, against a set I think he slow plays. I'd call and I'd go all in here, or reraise, get the money in the pot so he can't change his mind if his card doesn't hit. Seems like everyone in this forum wants to folds sets, at least wait until a flush or straight is on the board before folding and even then try to check-call it down.