Crazy, Byrne? Nah. Lazy, nah. The guy just did 3 different titles for DC. Art bland? Matter of taste but his story telling technique is good and certainly more classical than some of those muscle bound steroidal anime freaks posing as Superman.
I'll give him that. Like I said, ultimately I can't really fault the end result of an artist putting out 3 books per month --it's never going to be a perfect work of art. Even if you the artist in question is Jack Kirby or John Stanley (or Curt Swan).
What I grew to dislike about Byrne during that early Superman run which I hadn't noticed as a teen fan of his Fantastic Four is the gradual disappearance of backgrounds, his one-size-fits all body types (especially for women), and a general feel of assembly-line, by-the-numbers storytelling at a time when I was looking for something more in my comics. Perfectly entertaining genre material for the most part (I even gave in to the urge to buy a few issues of his West Coast Avengers years later when he brought back the Golden Age Human Torch).
What I resent about him still is his participation in the whole "revoot" project. (I thought you were making a Slim Galliard reference but then I noticed that v and b are near each other on my keyboard).