This probably isnt it, but i played it before and had trouble finding it after a few years when i wanted to play it again.
Space Empires (probably 4 or 5)
http://www.malfador.com/
Click SE:V
Try Crossfire. Its highly addicting (ive been playing it for the last month a LOT).
You rank up by playing games. As you get better you can buy new weapons.
You can join different maps and game modes.
Search and Destroy (basicly swat vs terror…
I wouldnt put the 'O' in ORPG for Titan Quest. The multiplayer on it blows.
Ive been searching for a D2 clone for a long long time, and the closest ive came so far was Dungeon Runners, which i didnt really like. Red Stone and Corum looked similar …
Titan Quest with expansion (TQ: Immortal Throne) was pretty good, and i was highly addicted to it for the first 2 weeks, playing 14 hours/day (even pulled 2 all-nighters), and after that i havnt touched it since. You get to choose 2 classes and mix …