Fun thread idea!
I'l break this down into time periods.
Overall:
3) Capcom - yes, the studio has a spotty recent history but it delivered amazing games in several different genres: Street Fighter, Devil May Cry, Resident Evil, Zack & Wiki, etc. Resident Evil 4 still sits in my top five list.
2) Rare - its quality diminished greatly after 2000 but before then it turned out what seemed like one great game a year, sometimes several great games a year. Quality titles include Jetpac (when it was known as Ultimate Play the Game), Donkey Kong Country, GoldenEye 007, Banjo-Kazooie, and Perfect Dark.
1) Nintendo - the hardware maker started making great games in 1982 and never stopped. 17 of my top 50 games are developed by Nintendo
Last ten years, 2008-2017:
3) From Software - Demon's Souls was a revelation for me, and Dark Souls captured my imagination
2) Monolith Soft - I don't even want to imagine a world in which Xenoblade Chronicles never arrived in North America
1) Nintendo - the past decade, like all decades, has been productive for Nintendo, which turned out great games in Wii Sports Resort, Skyward Sword, Super Mario Galaxy 2, Mario Kart 8, A Link Between Worlds, Splatoon, etc.
This year, 2017:
3) Capcom - Resident Evil 7 turned out to be the best game in the series since the sixth gen
tie-2) Inti Creates & Lizardcube - both tiny studios punched well above their weight with a pair of awesome retro remakes. Inti Creates turned in Blaster Master Zero and Lizardcube resurrected Wonder Boy: The Dragon's Trap
1) Nintendo - it would be hard to snub Nintendo when it released arguably the greatest game ever made in Breath of the Wild, and a racing game for the ages in Mario Kart 8 Deluxe
