It is inferior, but that goes without saying because everything is inferior to FS2. Worth playing but the dogfighting, controls and storyline aren't quite up to the same standard. It is a bit less linear however.
Given you want less well known games I'll offer up the following (to be fair some of these are quite well know to serious PC gamers, but I'll at least omit AAA titles or popular cross-platform franchises):
-Vampire Bloodlines: Terrific RPG, great atmosphere and brilliant dialogue
-Tribes Vengeance: Interesting combat mechanic, made fights more interesting
-Fahrenheit / Indigo Prophecy: I think this was remastered recently, if you've played Heavy Rain on PS3 or something like that it has some similarities
-Project Snowblind: Not the greatest game but if you like Deus Ex it kinda feels like an simplified action spin-off
-Chronicles of Riddick: Again this is a good, not great game but it feels quite different from most games. You spend a lot of time in a relatively familiar / contained environment, it kinda feels like being in a prison movie.
-Dawn of War: dunno if this counts as not well known, but for me this is very polished and entertaining RTS, basically like a modern version of Red Alert it is fairly accessible and you can pick it up fairly quickly rather than needing to be overly nerdy about it like you can with some more overwhelming RTS
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