I am not really impressed. I have seen such rendered battles before, and they always lack something. In this case, I think the combat scenes weren't dynamic enough, and the weapons effect didn't fit really fit their originals.
There needs to be a lot more weapon fire and more maneuvering.
Not that I could pull something like that off, and that it didn't like a lot of hard work.
To be fair though, this movie has been out there for several years.... when it was made, it probably was state of the art for a home computer at the time...
and it was a cool way to bring in about every major film/tv space ship into one big confrontation...