Hamlet: response 2

Act 3 just seems very ironic to me. Honestly there are so many examples: Hamlet's oxymoronic and condescending view of the play despite Hamlet being a play, Rosencrantz considering himself a "friend" (Act 3 scene 2 line 367)  even though he's spying on Hamlet, Polonius' death after telling the kind that he will report to him when he returns, Claudius' praying, Hamlet's killing of Polonius and more if I kept looking. I don't know if they really serve a purpose besides being ironic, but I thought that ironies usually showed up in Shakespeare's comedies. Maybe I'm looking too deep into something superficial or maybe I just haven't read Shakespeare in a while (it might be both...)