I've seen this many times now, where various players at the end of a pretty bad match will say "gg" as naturally as they are breathing, like it doesn't mean anything.
I, personally, don't enjoy matches that are one-sided, even if I'm on the winning team. I like matches that are competitive. Those are enjoyable. Those are good games. I've had this discussion numerous times with people and it appears to be pretty universal that a "good game" would require that the match is balanced enough to be competitive.
I've been playing recently on Euro servers (mainly DCC Laid back delight) during the daytime here when I take breaks from working. Team balance is always a problem on public servers, but it appears to be far WORSE of a problem on DCC laid back delight. I just played 6 matches today and 4 of them were off balance with resulting scores like 9-1, 10-2, 8-0 and such. 2 of the matches had an unbalanced number of players on the winning team, but also the skill level of the teams was unbalanced.
So, I don't say "gg" at the end of bad games. I just don't do it. I don't think it's polite to be untruthful. I just don't say anything, or I make a comment about the match being unbalanced, with the hopes that people will pay more attention to that in future matches.
I'm half venting here and half asking for feedback. This is an issue in Nexuiz that I've complained about from 2.5 years ago or whenever I first started playing Nexuiz. So I don't expect it to be "fixed" anytime soon.