I strongly recommend getting bundle and beating the average just for Dungeon Defenders alone. Aside from a few end-game progression issues, it's an incredible value, especially with the extremely, extremely large amount of DLC.
That said this is a great deal if you do end up liking the game because Trendy seems to be making most of their money by releasing dlc for dungeon defenders, and I think there is around $50 worth of dlc in the bundle. I have 25 dlcs listed for the game in my steam library, and I haven't spent any money on the game besides the purchase of the base game and the humble bundle.
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I doubt raising it as an issue would mean anything, sadly. People like me must be rarer than colour-blind linux users running xmonad.