I can't tell if this is more about hardware bias, software bias, or company bias, but I'm assuming company... So.
Short answer:
Nintendo +1
Long answer:
Nintendo:
-Standardized true 3D gaming on home consoles. In doing so, however, they marginalized 2D gaming on home consoles. -5
-Standardized four controller ports. +1
-Advance Wars. +3
-Pokemon. +3
-Standardized free-roam 3D gaming. Sorry guys. I'm not Jean-Paul Sartre; I'd rather not have to invent my own happiness or purpose in gaming. -5
-Yet when it comes to providing options, they're not great at it; they shoehorned stylus functionality into numerous DS games with no choice for the player to avoid it, forced Wii controls for Wii TP, etc. Choice is a good thing, usually. -2
-Retained $200-250 price for home consoles, generation after generation. +1
-Priced GBA and GBA SP at $100 to start, and DS at $150. -1
-Self-fulfullingly prophetic defeatist attitude--they've claimed for a long time now that it's misguided to continually produce sequels. Unfortunately, they can't claim to know this by experience considering that it took, you know, fifteen years after Super Mario World before another 2D Mario showed up. -3
-With the Game Boy line, they housed the only major sources of 2D gaming around from 1996-2004. +3
-Nintendo provided all my childhood gaming memories. +3
-Nintendo began to trash a lot of those childhood gaming memories starting with N64, thanks to 3D franchise iterations that couldn't approach their predecessors. At least the portable systems stayed fine. -2
-The Virtual Console. +5
-Smash Bros. +3
End tally: 4 points.
Sony:
-Introduced what I call honorary 2D games, or 3D games that play exactly like 2D games. Far from being a bad move, sometimes this can actually be a step up for 2D--allowing for such things as alternate costumes. +5
-Actively worked to sabotage actual 2D gaming. -7
-Standardized cinematics as almost a necessity for gaming. -1
-Enormous leap in graphical capabilities for a portable system. +2
-Enormous leap in price for a home console. -5
-Took them ten years longer than Nintendo, and five years longer than Microsoft, to provide four controller ports. -1
-Their hardware prices post-PS1 take so long to drop that I stop caring. -2
-Retained the SNES controller design, for the most part. I still don't think having four trigger buttons and clicking analog sticks was anything resembling necessary, but eh. +3
-Square, circle, triangle, X? David Hume would be spinning in his grave, knowing that anyone would intentionally use such abstract concepts for their buttons. -1
-PSN. +2
-I neither love nor hate their first-party franchises. +0
End tally: -5 points.
Microsoft:
-Kept the SNES four-button layout, but switched X/Y and A/B seemingly for no reason. Uh... thanks? +0
-Can't make any headway in Japan, leading to a dearth of Japanese support. -3
-Extra media functionality can run in the background while you're playing games. +2
-If any software library lacks 2D gaming, it's theirs. -2
-If any software library lacks a variety of genres in general, it's theirs. -5
-I can't think of a relevant philosopher to namedrop for no particular reason. -0
-Jack of all trades and master of none, with no compelling reason to choose them over either of the other two. -1
End tally: -9 points.