I keep pushing the Penguin crew down my to-buy list. It's not that the models don't look good. I particularly like the Penguin figure in the crew box. Rather, I have already bought, built or started painting figures for four other crews (Batman, Joker, Bane and League), so I'm trying to stay up to date and/or complete those before branching out even more.
It's really getting to be a challenge to keep up with the accelerated releases this year. Joker alone has had a LOT of new stuff, mainly Harley-centric which is cool, but it does feel like some of the other crews like Black Mask and Two-Face are really getting left behind.