Oh, I quite agree there; Colletta was awful. I suppose he only got jobs because he worked fast.
some actual quotes about him:
Rodrigo Baeza: "Colletta was appreciated by publishers because of his ability to turn out professional-looking work on a short time. However, in his efforts to meet deadlines, Colletta would frequently erase details from the pencilled pages he received.... Magazines like the Jack Kirby Collector have shown examples of the pencilled pages Colletta received side-by-side with the finished, inked pages, and the differences can be very evident. The end result would still be printable, but costume details would disappear, patterns in buildings would be simplified, and sometimes background objects would be rubbed out".
Mark Evanier: "In 1970 when Steve Sherman and I met Steve Ditko, he asked us about the new Kirby books that were then about to debut at DC. When we told him Colletta was handling the inking, he winced and said that he would probably not look at the comics. Back when he was working for Marvel, Ditko said he'd pick up the latest issues in the office and always check the credits before taking the comics home. If he found Colletta's name — especially as Kirby's embellisher — he would make a point of putting the comic back, or even in a wastebasket. And he'd make sure Stan saw what he was doing and knew the reason why".
Len Wein, on what he enjoyed most about working on Luke Cage: "Getting to work with the wonderful George Tuska, before Vinnie Colletta got his hands on the pencils and ruined them".
source:
http://en.wikipedia.org/wiki/Vince_Colletta