I've been playing on modern warfare for a week now but went back and had a few games on the conduit last night -
Frame rate / graphics - yes the conduit looks better, the texture of walls, floor etc are great but after a short time it all becomes very boring, levels are simple and just mirror images of themselves.
Ok so MW isn't the best I’ve seen but at least on par with COD5; and you can interact with objects-blow up cars, shoot cans etc etc (missing from Conduit)
Reviewers seem to compare this to the xbox or ps3 too much, no game on the wii is going to match them for graphics.
One of the best things (also missing from conduit) is that you can run, it makes for much better gameplay. Frame rate just isn't an issue and doesn't impact on gameplay whatsoever, why reviewers are commenting on it i have no idea???(again maybe compared to ps3 /xbox)
I actually think the gameplay is better on the wii. Having less people per match is surprisingly better, yes better!
18people in one match can be too much, it's way too confusing, with people just running around everywhere (have a look at some of the xbox/ ps3 MW2 videos to see what i mean) As soon as you kill someone an opponent then kills you, less players seems to bring out a more tactical approach.
Conduit takes ages to get started maybe this is for wii speak? not sure but is so annoying. With MW you are in a lobby straight away and I haven't experienced any lag at all. Yes shame no wii speak on MW (there's nothing funnier that hearing beverage die on the conduit !)
Aiming is also fine no different than COD5 or conduit, I got a 15 kill streak the other day (and others have much higher) Now if aiming was a problem this just wouldn't happen, everyone would just get one or two kills then die.
Anyway... hope this answers your question.