Eh, I don't think games not being exclusive should eliminate a console from being S tier personally (and yes, something like a Steam Deck is absolutely S tier for it's library). Other S tier consoles that were strongly carried by exclusives either had the majority of them defacto from third parties (PS1 and PS2), or suffered heavily overall for the lack of games available on opposing platforms (SNES, Switch).
PS4 and 360 both land in a place where they shared the majority of their library with a direct competitor... but they were pretty much objectively the better place to play nearly every defining release of their respective generations. It's why I also disagree that consoles with similar libraries cannot be separated by a whole tier. If you're a worse, more expensive and possibly later arriving choice for the most important games of a generation, that's absolutely enough of a knock to put you a tier lower. Conversely being the better, cheaper and earlier arriving entry on the market for a generation of amazing and defining software should be reason to be placed a tier higher than the competition also.
And whilst many of the games listed were indeed multiplat... the insane release runs that they're talking about were made insane partially by the exclusive titles bolstering them. Bioshock, Halo 3 and Mass Effect were all not available to PS3 during that run, neither was Fable 2 and Gears 2. Gears 3 and Oblivion weren't either (though they appear to have mixed Oblivion and Skyrim up). Even some of the absolute best multiplatform titles of the gen like Oblivion, Bioshock and Mass Effect hit 360 as exclusives at least initially. And of all the games in that lineup, how many would the average person have received a better experience on PS3 than 360 playing them?
Much the same argument can be justifiably made for the PS4 over the XB1. XB1 getting the likes of Nier Automata eventually does very little to detract from how much of an asset it was for PS4 upon release, and there are few multiplatform titles that the average person would have experienced better on an XB1 than on a PS4. I actually think given the comparison it could be argued that for the average person the PS3 may deserve to suffer a 2 tier drop if the 3 tier gap of the XB1 is justified.
You're a Sega zealot, or at the very least a more niche type of user that would be posting on a forum such as this. Sega have always been my favorite of the console manufacturers... but if I had to create a tier list that wasn't just representative of my own personal tastes, I would find it extremely difficult to come up with arguments for any of their consoles other than the Genesis as being amongst the most sound choices for their respective generations.
N64 is as high as it should ever realistically be. It's library is far too shallow relative to other consoles to justify being any higher. Being an N64 only gamer that generation was rough in many ways.
