Im a blizzard and a valve fanboy, and i have to wholehartedly disagree with blizzard
Valve make quality games...simple as, dota 2 is going to be a fantastic game made by talented people...who cares who is making money, who is losing out...the CONSUMERS are winning here
Blizzard could have trademarked the dota name, then made D3, then made the next 2 SC2's, then a new MMO, then probably warcraft 4, THEN made DOTA 2, release date 2020...
No, if you ask me, this trademark is with the right people, im so happy that valve is branching out from its FPS roots, and making a high fantasy game instead of zombies or science fiction
TF2 cost a third of a game via orange box, and over the years, its been expanded (for free) to be five times the size at launch...DOTA 2 is going to be excellent, i guarantee it, and i reckon valve should be safe to know that their hard work is protected by this trademark, they deserve it
blizz > valve though
edit: another point: would you rather have someone like EA or similar owning the rights? no...i thought not