Valve and Blizzard for sure over Retro and Naughty Dog. Naughty Dog has what 1 great franchise and one other great game? Retro is just an arm of Nintendo. Valve has Half Life, Portal, Dota,Counter Strike, Left4Dead, and TF2. Blizzard really only had 3 IPs, but those 3 IPs are 3 of the biggest in the gaming world with Warcraft, Starcraft, and Diablo.
If I had to rank mine I'd go
1. Valve
2. Rockstar
3. Bethesda
4. Nintendo
5. Blizzard
The shame for me is there are 2 that used to be my favorites but have sucked after big acquisitions being Rare and Bioware. Rare was amazing as Nintendo's right arm. Killer Instinct, Donkey Kong everything, Blastcorps, Goldeneye, Banjo and Kazooie, Jet Force Gemini, and Perfect Dark to name a few. Then Microsoft bought them and pretty much nothing happened. They've made a conker game for XBox, a PD game that I think was XBox arcade, the Viva Pinata series and Kinect sports. Shame from a former powerhouse. Bioware was legendary before EA bought them out. Baldur's Gate, Neverwinter Nights, KOTOR and Mass Effect. Then EA came in and turned it to a much lesser studio, while still releasing good games, not on that legendary level.