5. Privateer
4. Rome: Total War
3. Ultima Online
2. Age Of Kings
1. Dark Forces
There was just nothing like Dark Forces back in 1995. The incredible style of each level. The lag free play even on a 486. The complexity of the levels. The use of the Star Wars franchise without hammering you over the head with it. The varying combat that was never formulaic. The sound effects.
Honorable mention: Tie Fighter