[Lawtan]

Hmm...while I really like FPS games, I am rather behind on them. Most of the ones I enjoyed died with GameSpy, recently.

HAWK3N is a fun free-to-play online Mecha-shooter.

Battlefield 2142 is/was amazingness. It died, but a dedicated group of fans are working to bring it back, EA or no EA. It's not as sleek and world-shifting as most of the ones you tried, but it has elements of a strategy game, a strong squad-based system, involved Mecha, VTOLs (Vertical Take-off and Landing Vehicles), tanks, Super-tanks, speeders...and motion tracking Mines, and Invisibility, and all...

A game I'd like to play but lack the money/friends to play would be Shattered Horizon. It's a Zero-Gravity Asteroid FPS. I have yet to see that concept recreated.

Titanfall - it looks like a good game, but I feel it is streamlined and way too pricy. (You charge a Skyrim amount for games that are Battlefield 2: Bad Company + Parkouring Mecha...yeah, no)

Interstellar Marines looks like it may be fun to play...but $18-43 is too much for me at this point in life. It is also still in Beta.

Though it is more "Airship First-Person Simulation" Than FPS, I'll continue promoting Guns of Icarus, in hopes of finding people to play with...