A lot of games give big hype and don't deliver upon release: this is not one of those games. This is the best FPS I've played in a while. The story, weapons, characters, and mechanics were all superb. Did anyone else catch those tributes to Lost and Borat in the campaign?
If you're looking for a filler game to play while you're waiting for another game to release or become available, then Singularity is for you. Similar to many other reviews, Singularity attempts to mimic Bioshock too much. The ability to wield weapons and the TD (Weapons and Plasmids), the warped enemies that used to be humans (Splicers), the time travel between 1955 and 2010 (1950s and 1960s Rapture), the audio-recordings (Audio-diaries in Rapture), the constant flashbacks....get the picture? It is disappointing if you are a fan of Bioshock 1+2 because the similarities are so striking that it is difficult to play without going "Ugh, I've seen this already, show me something new already." Aside from this, the controls are dodgy and the health/td meter can become obnoxious. Health is depleted too quickly and TD takes too long to replenish. The graphics are ok, but not smooth. Guns are interesting, but are the basic types you would find in Half-life, Bioshock, or any other FPS (Pistol, AK, sniper, grenade launcher, etc). The Seeker is unique, but once again takes the idea of "curving bullets" and slowing time from the game/movie Wanted. The time-travel sequences are unique and cool, but are few and far between. It is a quick game, only about 7-8 hours, so it won't seem like a waste if you don't end up liking it. I would say it is worth renting and playing once, maybe twice. Otherwise, don't spend the $60 to buy it.