I agree. I'd like to see more Imperial victories in the storylines. I mean, we lose Balmorra, Corellia, Malgus, the Emperor (not that I want that *** to win), Imperial Intelligence, etc. etc. It's quite disheartening to learn that all your Imperial effort is moot once you play through planets on the Republic side. What do we win? Yay Taris, a swampy, contaminated wasteland full of zombies.
Taris in particular hurts because that one is more of a SYMBOLIC victory. It doesn't hold some great secret to the force, an important resource, or even act as a staging ground for further expansion! The people in charge just don't want to see it rebuilt because Malak destroyed it, and they think it's a good symbol of Sith strength!