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In general if it's gonna be a PC game with shit tons of Mods and Customizations from it's community and fanbase I will be interested, because I never liked the whole DLC business model, since they like to milk it as much as possible.
Here are a couple of these that support custom MODs:
If there are no mods or free customizations available, then I look for things like fun factor and gameplay, objective based co-op gameplay in particular, stuff in the game that's worth laughing your ass off about, that sort of thing, but I'll take recommendations from anyone.0