I think Soule is a great composer, however I've always said that his stuff all sounds the same. As soon as I start up a game, I can tell immediately if Soule did its music. Morrowind, Oblivion, Dawn of War, GW, it's all the same set of instruments and very similar scores.
But don't get me wrong, the music is very well done.
I do think that GW's music is great for peaceful villages but not really fitting for combat. It didn't take long for me to turn off GW's music and run my own playlist while playing. (I strongly suggest the E.S. Posthumus album Unearthed, it's awesome for intense things like GvG!)
I think Soule's best work was the Knight of the Old Republic soundtrack. The music isn't instantly recognizable as his, and it's a lot more upbeat and dramatic than his usual stuff. He did an amazing job of making original music that sounded like Star Wars without being a rip off of it.