Good and I hope he isn't seen seen in any future Marvel movie either, because I find his cameos usually annoying. I think it's because they are too obvious and in your face. A good cameo is easy to miss, that is not possible with Stan Lee being front and center and usually getting a line.
I honestly don't give a crap if he co-created a bunch of characters, Joanne K. Rowling created Harry Potter all by herself and they didn't put a witch hat on her head and had her mug for the camera in every Harry Potter movie. Just because someone's the creator doesn't mean he or she should appear all the time.
The only one who pulled off a bunch of cameos was Hitchcock and that only worked because they really were blink and you'll miss it cameos and not "Look at me, I'm right here!" scenes.
You've not seen the one from Marnie have you? Or North by Northwest. I would count his cameos as in exactly the same spirit as the Stan Lees ones, a bit of a fun nod and a wink to the audience, and they are certainly often less-than-subtle.
Besides, Stan Lee being front and centre is the whole point! The Marvel films are meant to be fun. They're not, ultimately, meant to be taken remotely seriously. Stan Lee's inclusion just underlines this. They always make me smile and I can't think of a single one where his inclusion hasn't made the film a little bit extra special.
