The guys and gals over at Upper Deck designed the boosters pretty well. Even though randomized, you're only going to get mini's of that faction. Between 3 friends we've opened just over two cases and we've gotten 5 Epics and almost every mini available. The scale is 40mm, so bigger than Warmachine/hammer.
Gameplay is rather balanced in that you don't have to spend mucho dollares to get a good team and have fun. Quick, simple, mostly straightforward rules make it a great just get together for an evening game, but is deep enough to reward competitive play.