I played a kender wizard in a short-lived dragonlance game, it was one of the most fun characters i've ever played. It takes a DM willing to let you be silly and fun (for instance, party is beginning a fight with a minotaur, DM: 'Hey, that minotaur has a nice big shiny ring in his nose' , Me: Jump up and grab it !, DM: <ajudicates what should happen, everyone has a laugh, game goes on> )
(second for instance (i was dm'ing this so had to npc-ish the kender), party is exploring a cave that turns into worked stone, finds a kind of platform with a handle, everyone's looking at inscriptions, etc, kender just pulls the handle and teleport vanishes, party debates whether to try and follow and find him )
They're fun with the right kind of player and DM, if you're very much the little-too-serious "omg he stole my belt i'll kill him yaarrrr!" then you probably wont like kender.
(before someone says OMG noob kender cant concentrate long enough to be a wizard blah blah, we had a set of compromises such as, always had to take spell mastery (so I didnt need a spellbook), and a few other things that I cant remember, but it was reasonable )