I would personally like to thank Mark Millar for everything he's contributed to Marvel. Civil War was an amazing shake up of the Marvel universe, he pretty much created the Marvel Zombies, 1985 was great and Old Man Logan was one of the best wolverine stories for a loooong time. Also Kick-Ass is pretty good!
To be honest, I did find myself agreeing with the "thats it?" sentiment. As good as Kick Ass was, i did get to the end of each issue and feel the same. There's been more 'meat' to his other work.