I can and I will on the sole basis that awesome controls>>>awesome graphics, which is the only thing separating CoD4 and its ilk from The Conduit.
I'm on the fence about Bioshock because while it did present some pretty neat philosophical elements, the gameplay was pretty lacking. The plasmids were nice, but they were all pretty standard affair, and if you're talking about specifically the console version of Bioshock, I'm still going with The Conduit because gamepad FPS controls are a pile of crap, and the multiplayer in The Conduit makes up for what it lacks in single-player (which, going by the single-player in the vast majority of FPSes today, is up to snuff for the most part anyway).
The Conduit finally brings the deciding factor between FPSes on the PC and the ones on the consoles to the Wii. The controls really are just that good, and that's why the only console FPSes I own are Goldeneye, Perfect Dark, and Timesplitters 2.
Yeah, I have to admit the controls are better in the PC version of Bioshock than in the PS3 version (I own both), mostly because the PS3's flimsy L2 and R2 buttons are terrible for this kind of constant action. Not by a large amount, but it is noticeable. As for the gameplay, my only real problem with the game is that the game becomes pretty monotonous in the last 4th or so of the game when enemies are suddenly resistant to everything and your chemical weapon/machine gun/grenade launcher are the only weapons that kill anything reliably (and plasmids are useless). Well, that and the final boss is extremely lame. Otherwise, what I appreciate about the gameplay in Bioshock is that it is what you make of it. You can handle most situations in at least a half-dozen different ways depending on your playing style, at least till the end of the game. If you want it to be a straight-up shooter, you can do that. If you want to go nuts with the various plasmid powers, you can do that too. If you just want to go around clubbing things with your wrench, with the proper tonics you can even do that.
All too true about the plasmids, though. I never did use more than the standard lightning; flame; and occasionally telekinesis (mainly for drawing in far-off items). Ice was cool, but because you couldn't scavenge the bodies afterwards it wasn't cost-effective to use, and overall there just isn't enough Adam to really experiment with the plasmids unless you want to neglect most everything else. At least Bioshock 2 looks to improve on that, at least based on the videos thus far.
Btw, if you liked Timesplitters 2 you should try Timesplitters 3 on the GameCube. The single-player's not as good (mostly because it's lacking that cool aspect of Timesplitters 2 where the higher the difficulty level, the more of the level the game opened up to you and the more objectives you had), but it's still quite solid and funny. Multiplayer is arguably more of the same, but in the case of Timeplitters that's not really a bad thing.