I took a risk with Shattered Horizon. It's an online-only FPS with motion-sickness-inducing six-degrees of freedom action. I find neither quality particularly endearing. Nonetheless, its high-frontier setting coupled with its low price were enough to convince me to part with my hard-earned money.
Considering it was developed by Futuremark, creators of those spiffy benchmark programs, the graphics were hardly as mind-blowing as I expected. Nonetheless, they were more than passable. It took me a while to get a hang of the slow, topsy-turvy maneuvering, but I rather enjoyed the mix of slow movement, inaccurate weapons and sudden death. The game offers a unique feature of "going dark", turning off your suit electronics which prevents you from showing up on other people's radar. Unfortunately, given the extremely low population of the game-servers (I met one other person still playing!) this makes combat extremely dull; it's impossible to find anybody! We spent one round of combat just flitting about the level trying to unsuccessfully locate one another.
The game does feature offline combat against 'bots but they are a poor replacement for the chaotic frenzy of human gamers. And the menu interface could have used an extra shine of polish, as it was rather bare bones. Its a shame this title never took off because, while it would hardly replace single-player gaming for me, its stately combat was more appealing to me than most other online FPS.