I get the impression that gketter means overexposure in a short time span. It's one thing for long established, popular characters, vs those who appeared in a single movie and because of that they're crossing over with and appearing in anything and everything, regardless of whether it makes any sense or not.
Except that gketter compared Rocket and Groots overexposure to Wolverine, who is just as much as an "established, popular character" as Batman is.
I just found it funny someone proclaims overexposure when they (and two other posters) have one of the most overexposed characters in comic history as their avatar.