I would not consider anything that involved playing a console as a "party" unless it were guitar hero (or rock band now I guess) or the people there were under the age of 16, sounds more like a gathering to me. Not the point I know.
Anyway, it's just lack of exposure to games, and it's just an opinion. It's not as if their word is fact and maybe they haven't played many games recently. It's like all things in life, just because they think it's great, doesn't mean it is and just because you think it's not great, doesn't mean it isn't. Hell, I had a whole lot of fun when I first played a Gundam game on PS2, even though the general consensus (spelling) among non-japanese gamers is that they are utter crap. I also enjoyed one of the last 2d Dragon Ball Z fighters on the PS1, even though most thought it was terrible (thing it was called Ultimate Battle 22 or something like that).
I also enjoyed the torment that was the original TMNT game on the NES (I was 5 back then though). Oh and I absolutely hate WoW. Am I now considered a non-gamer because I love games that 95% of gamers hate? it's an opinion. I'm sure there are some games you really enjoyed that would be considered shovelware or below average by most here.
Best thing you can do is set a good example by having a AAA title at your gatherings, but don't call people idiots just because they have different tastes to yours, in fact, WE could be idiots by following a bunch of glorified nerds with "editor" written across their foreheads who posts on an internet site that the game sucked and believing it is true because they said so.