To set it straight, the First game was absolutly amazing for its time. RTS wit ha very good 4x elements.
The main reason imo that he 2nd game was a flop, was do to the fact that there wasn't anything special about it and there were some elements to the game that made it nearly unplayable.
A few small examples:
1) The main warrior race( I forget the name) had a lightening gun that had tremendous range and damage and would always hit. The human equivelant was this meson charge thing the went like .03 miles per hour and did half the damage for the same cost. The only way to beat the bigger warior race guys was to have many more ships then they did, however there ships were cheaprer to produce.
2) The single player was only the campaigns for each race(3 of them) and that in multiplayer there was no pausing the game for any reason. So if you wanted to start out from scratch or with friends, you had to play a multiplayer and in multi, there was no pause for anything. You had to manage your planets( because the planetary manager was for crap) which took anywhere from 5 min to 45 min depending on howmany planets you had, how organized you wanted them to be and what you wanted to build on which planet. You could have a battle with an enemy fleet and get done to find out that you have lost three other battles because there was no indicator.
Long story short, there was a lot wrong with it. The two things they did right, were done VERY right!
First was that the graphics were dang good for the time, and the second was the planetary defenses. Not he grond fightng, but the space side of it. You had orbital defense stations and satilites with ground based defensive energy turrets. I was the best. I loved that game for that. I would almost never build a fleet, I just wanted to watch my stations and the like fight. It was killer.