Not a bad roundup rockingnic, but you forgot the single most important (IMO) factor, that should never be forgotten/discounted but it invariably is: personal preference. One person's "easy to master" might be another person's "why must my thumbs do everything?", and one person's "mods are awesome!" is another person's "mods, why would I want mods?"
Me, I voted "Sometimes", 'cause my preference for FPS is PC (can't for the life of me get the hang of aiming with a thumbstick; my eyes/brain/nerves/thumbs just don't work like that) but my preference for brawlers is 360 (melee-style games just "feel" better to me with a controller than with a mouse).