StingingVelvet: Its funny you wanted to bring this up here, since we talk about it every other day already :P
Anyway, I like substantial content that basically replaces the expansions of old. Stuff like New Vegas and Mass Effect 2 got. Not as large as expansions but similar and cheaper.
I don't like the small stuff and tend not to support it.
Though really what is evil is up to the market and the market seems to like small stuff and pre-order bonuses.
hedwards: Yeah, the FO:NV DLC was mostly pretty good, although Old World Blues and Dead Money were really the only ones worth getting. FO3, bugs aside, the Pitt and Operation Anchorage were worth getting and possibly Point Look.
IMHO it needs to be a substantial addition rather than content that should have been in the base game and it needs to offer something compelling. The main issue with the FO DLC has been overpowered rewards like the Chinese Stealth suit and manufacturing ammunition that takes the rest of the game out of balance.
The Missing Link also added quite a bit of great content. It was 15 USD, though, which is steep. I waited for a sale, I wonder how many paid the 15, though.
Foxhack: All new levels, maybe a storyline expansion = OK
Horse Armor = NOT OK
You know, I still think some cosmetic DLC is dumb, overpriced, and greedy. In retrospect, though, the whole Horse Armor thing seemed blown out of proportion, wasn't it a buck? And completely freaking optional? I mean, it wasn't the only way to avoid having to look at your noble steed's case of genital warts or anything...