budejovice: I may be in the minority, but I hold IR in higher regard than Groupees. But this didn't do anything for me at all.
Cyraxpt: Seriously doubt that, even if IR bundles are.... weak, at least they don't spam 5 different bundles a week full of garbage. If there's a ranking it would be:
Humble Bundle > Bundle Stars > Indie Royale > Groupees = Indie Gala
Indie Royale used to be pretty fine, but lately, and I mean for months now, I've found it to be lame trash, when there is even a new bundle at all. I often buy the Debut stuff, but it's been a while since I saw anything of interest there.
Groupees seems to me a healthy if odd mix of solid or promising games, and standard shovelware.
Indie Gala, despite the general disdain, is my most frequent purchase of the minority sites; while the quality does go up and down, overall they often post games that I either want or am willing to try.
Just my opinion.