Blizzard is better because it made Diablo, Wow, and Defense of the Ancients
Defense of the Ancients, nope
I'm pretty sure this was a custom WC3 map made by a third party, and not Blizzard.
Defense of the Ancients was a Warcraft III mod based on Aion of Strife - a map on the original Starcraft. In a way, Blizzard is indirectly at fault for this being made, having made the two games it developed from.
From there games like League of Legends, Heroes of Neworth and soon to come DotA2 have sprung. It is in a way, an entirely new genre - and has been used in high-end competitions. It's possibly the most renowned mod ever.
Blizzards games are (and my opinion on them):
World of Warcraft - Top leading MMO game, not incredibly innovative as it takes ideas from every other game and refines them (which is, nowadays, the business, and I like it), making everything you want in a single package.
RIFT has taken notice of the lack of any "worldly atmosphere" in the game and has made much more activity through it using a RIFT mechanic.
Starcraft - High competitive eSports game with incredibly fluent editor (I've played a DotA remake on it), balanced for 1v1 and holds 3 races in an incredible storyline.
Warcraft - The prelude to the MMO World of Warcraft (but probably wasn't treated as such before the idea of WoW came up). Incredible lore, but I am unsure of how competitive it was (although I've heard much about W3 players playing SC2 and so on).
Diablo - A dungeon third-person slash-em-up game with a small amount of abilities, a varied class system and different play styles against different enemies - basically, you haven't got tonnes of one thing, a little of another, to vary the gameplay. You've got plenty of different situations, combos and etc to define how you may want to act.
That's it, as far as I know.
Oh, and Mass Effect II is second-best RPG I've played. Fable I takes the lead because I learnt quite a lot from it (I can elaborate on your profile if you ask
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- H