Nintendo- no explaination needed.

EA- I might get hate for this, but they have made many games that were a part of my childhood. SSX, NBA street, Burnout, Skate, Need for Speed, Battlefield Bad company 2, NHL series and more have all given me countless good times throughout the years

Rockstar-I could give them the spot for GTA alone, but theres also midnight club, table tennis, and rdr on top of that.

Honorable mentions:
Bethesda
Sony
Microsoft

I like a game or two from most other publishers as well. Dead rising series and okami from capcom, Just cause from SE, and so on.

nintendo, capcom, ubisoft..this is just based on the fact i own more games from these 3 publishers than any other

Nintendo
Blizzard (not the Activision part)
Sony

Nintendo - Its Nintendo games!
Activision Blizzard - Mostly for Blizzard games!
Warner Bro Interactive - Batman, LOTR

Honourable Mentions:
Sony Interactive
Microsoft Game Studios
Ubisoft
Square Enix
Atlus

Uh, maybe Nintendo, but other than that, I can't remember a single publisher that I like in any way. There might be some, but the ones I remember are all either bad or horrible. Well, I guess Sony is sort of OK, but I don't really like Sony too much either. I like a lot of devs, but I publishers are generally horrible.

Title should be "What are your three favorite publishers?" 

Nintendo, Sega and I guess either Bamco or Square Enix seem to publish most of the games I play.

I've just realized that most of my top 20 is published either by Nintendo or Squaresoft/Square-Enix.

Third place would be  Bandai Namco or Sony.

Sony is the only one I actively pay attention to as they’re the only one who try hardest to bring out new IPs.

Very true, wth was I thinking???