Ok guys I just recently tried to go back and play Gears of war and Lost Planet on my 360. I got to say right now, that both of those games run better by a long shot on the PC(if you have a decent one that is) the packet loss is alot less, and it costs no monthly fees. BTW I use a controller in these two games as well, since I use my HDTV for my computer monitor, and video game console display.
In Lost planet any time there is an abundance of plasma grenades going off the 360 takes a dump, and drops to somewhere in the 10-15FPS range. On the map "Island 902" when the bridges get knocked down, the same thing happens. On my PC it does not happen.
With GOW things are not so bad, but still highly noticable. To this day GOW 1 on the PC still looks alot better than GOW 1/2 on the 360. While playing online you can see your ping, so atleast if the game your in is really laggy you can leave and find a server with a lower ping. The biggest difference I think though is the fact that the controller in GOW 1/2 on the console kinda feels clunky, or not as smooth/responsive as it should be. No problems at all with the 360 controller on the PC, smooth as butter.
The community on the PC is alot more mature as well. No screaming 12 year olds. FTW! Now I will admit that the community is alot larger on the consoles, but really as long as you have people to play with, that's all that matters.
Flame me if you want, but all I'm doing is stating facts. I had about 10-15 of my good buddies from the 360 switch to the PC over the last year, and not one of them has gone back yet. We have been playing GOW, UT3, Lost Planet Colonies, MW2, Dirt 2, and soon to be AvP, and Battlefield BC 2.
Oh ya I forgot to mention that the PC is NOT just a gaming console. It has alot more uses than just games. lol