TheWorldIsFlat: That's basically what I meant, it's exactly the same as SC1 (maybe I will figure out how to handle the low-on-energy situation, it was pretty bad)
Achievements: That's what I meant. The problem is that every time I play a map with this system, it works the same stupid way, newbies are allowed to play only the weakest heroes, while experienced players can have overpowered heroes, and you need hundreds of games to unlock them. That is what I find very discouraging. But if it was just a graphics upgrade (like every hull type had a protoss version that you could unlock with different achievements), it could work.