Volition has been a long standing company with a slew of awesome games. They did a ton with THQ like 20 years ago that were amazing.
Summoner is one of my favorite games to date. It didn't age well, but the story was amazing.
The descent games were intense as well.
I couldn't find it on their wiki page, but I'm pretty sure they had a hand in loads of wrestling games in the late 90's early 2000's. WWF no mercy, smack down 1-4 as well.
As for saints row, I beat 1-3. The storyline to the first was unmatched by any GTA storyline. It was a shame to see them slink away from the original due to ridicule of being a "GTA clone." The story was compelling, the voice acting outside of johnny gat was decent. The multiplayer experience offered far more than anything GTA had at the time. The best we got for GTA was in 2008 when they released their free roam multiplayer with GTA 4. By then saints row 2 had full coop.
Case and point. You're either too young to know this developer in their prime, too retarded to recognize the loss of a good developer (albeit they haven't put out much in the last few years), or both.