I thought Doom 3 was an excellent game. I still enjoy playing it to this day. But I have to be in the right mood for it... WHen I just want to mindlessly slaughter zombies and make big gooey piles of biohazardous alien leftovers, nothing does the job better than Doom 3.
Now Prey... talk about a game that pissed me off. Sure, the graphics were nice but when you die enough times and have to keep doing that B.S. spirit world death thing, it totally kills the game. The demo was awesome but they smartly cut the demo short right before the game turned stupid. I'm not surprised it only took 45 days for it's price to go from 49.99 to 19.99.
FEAR... way too repetitive, but more annoying was their over-use of military terminology. It's like they took the military dictionary, and dared themselves to see how many of the words they could cram into each sentence. Talk about over-realism. Of the three... Prey and FEAR sit on my shelf gathering dust after 6 months; Doom 3 gets played even after several years (as does Quake 4).