No one did say it's bad. It's just the guys who read manga a lot, it's like a self inflected curse. At all times we do compare both anime manga, all pros and cons and stuff like that.
And then just add our opinion about it in threads like this. The guys with enough age under they're belt never argues much about which one is better as long it's good and properly made anime^^
And it indeed is a really good anime in any way you look at it :P