Okay, my two cents...
First off all, I'm sure the actor playing the Joker is great, and he'll give his best.
But.... the way he looks and those few seconds that I've seen ( and where suppose to be picked to make me excited) makes me think I'm looking at Zass dressed up as the joker so WB can get a bit more of that Joker pie.
The trailer overall looks like an overwhelming "meh" with the usual dark broody "realism" that most of DC seems to be having these days.
Everything up unto this point makes me believe that this is just another by-the-books production.
I, for one, can't wait for the bit where they have a internal fight about something-or-the-other that splits the group up, but eventually come back together for the big final sequence.
Oh... and that line "I put them in a hole, and threw away the hole" yeah.... that was as cring worthy as this:
http://img-9gag-fun.9cache.com/photo/a6LM9QN_460sv.mp4
(no idea how to embed that.)