Here's Ervin Santana dropping down 2 sac bunts in a game. Just wanted to show that they're in there for the guys who really haven't seen one yet. I'm not sure if difficulty factors into this, but it was on Veteran (because DD). I've done the same in Franchise, as a primarily NL player.
Santana is 30 bunt rating, so it doesn't take much to have a successful one.
....Yes, I know he's still holding the bat (or rather, it warps back into his hand). That's a replay bug - it didn't happen in real time.
I've seen some successful bunts, but I do think they need to tune the rocket bunts out....or at least tone them down a bit. It's a very odd to see the ball fly off the bat like that on a bunt....no very realistic.