Here is a good place to go
The Atomic Think Tank • Index page
I have played the game and have a few things about it.
1. Ultimate powers is like the PHBII. Lots of good options for more powers there, though jsutthe original rulebook is enough.
2. It is pretty easy to learn once you have done a d20 game, except no hit points, only dmage saves.
3. There is a huge amount of versatility in the rules, which are point buy.
4. Most, but not all, standard hero concepts work well in the rules.
5. AT the Atomic think tank, check out people's builds of every comic book character you can think of. Finding opponents is very very easy, just reskin and go with them.
A few problems though
1. It is a min-maxer's dream. Point buy usually is, but it is very possible to make an unkillable character under any normal circumstances. Or at least an over dominating one.
2. Weaknesses give very few points compared to the power you are losing. For example disintigrating any target is 5pp/rank, but only disintigrating non-living is 4pp/rank. Not much saving for the power you are losing.
3. Tradeoffs. The book allows tradeoffs, but the two sides are not equal, so it is a sure way to more power. For example getting higher toughness while dropping defense is popular, you will never see people doing it the other say.
4. Power level. Everything is limited by power level, but not well enough. The exceptions there can break the game. Watch for tough characters with a toughness tradeoff and Impervious. They can be immune to most attacks at their power level.
All this said, it is an excellent Superhero game, though it is necessary to watch character creation very closely. I played it, and even ran it, a bit and enjoyed it but will probably not do so again. The min-maxing was too much for me.