I've actually been working on a platformer using phys2D for the past 3 months, and yes, it's definitely an interesting situation, especially because I want the player to do an almost obscene number of actions, like clinging to ledges and doing blackflips and all kinds of other craziness. I have probably spent half the development time tweaking physics, and there's still a long way to go. But I'm confident to come up with something very cool.

http://www.javagaming.org/forums/index.php?topic=18491.0