I've seen all three multiple times and here's my take

Def Leppard - great live until Joe sings, then very disappointing, his voice just can't take it anymore and as far back as the Hysteria tour he just can't sing the stuff live.
Poison - great energy and concert, but same concert every time, I guess it's a case of giving the fans what they want.
Cheap Trick - talented guys, but the guitar collection is way more interesting than anything else, just too boring for me

Honestly I wouldn't have given any of these bands more than one try, they all are washed up in one way or another and weren't really entertaining.
Dave