Maybe I haven't played it deeply enough, but I've loved what I've played of Batman 66. The screen is awesome, the playfield is colorful and well designed. I don't feel like the game is trying to rob me, or that it has a huge gap between the flippers. Maybe I'm not good enough to fully see all the issues.
As for worst, I really can't pick one. Most frustrating for me might be Ghostbusters, that ball just careens down the middle all the time haha!