That's still opinion, predicated upon the idea that all players find the game pointless once they had a condenser and collector array set up. That isn't universally true. Look, "the moon is made of cheese" is statement which, upon testing, has a binary outcome. Either the moon is made of cheese or it isn't, and that's easy to test. "EE is unbalanced" is, based on the rest of your post, a reflection of your personal experience that Equivalent Exchange causes people to grow bored with a server too quickly. The latter is on a continuum, as there is no universally agreed-upon standard for how long people should stay interested in a server. Furthermore, given how frightfully disparaging some tekkit players have been on the MCF thread for EE regarding the removal of collectors/condensors, I'm betting that not everyone got bored with their EE2 server within a week. So yeah, the idea that EE is unbalanced is still opinion, no matter how strongly you feel that way.
As an aside, most of my experience with EE is single player, whereas the most vocal haters of the mod all complain that it breaks their server. If "balance" is defined as a mechanism which reduces the longevity of a given world-save, then it's entirely possible that EE2 was better balanced for single player than for multiplayer. And before you go insisting that multiplayer is all that matters, FTB is meant to facillitate both SSP & SMP.