I agree with you, and, honestly, sometimes it's exhausting to try and steer the mindless masses away from their own stupidity, so I've forced myself to step back sometimes and just roll with it... but...
I completely understand this mentality as well. I like winning. I want to win. Also, I find that the most enjoyable matches I've ever had are ones in which there was a heated competition for first... That doesn't happen when two teams power focus one another and ignore GC 3, letting them do whatever they want. Further, some of the fights are less enjoyable because they inevitably turn into a 2v1 gang bang. I can't count how many times I've gotten into a fight with Mael, a good, honest, fight only to have the Adders sweep in the middle of it and just get in the way. It's like getting blue balled. The fight's not as satisfying because you never felt like you got to finish it....
I like it as a game mode, and 3 way fights make for a dynamic and interesting battle field, but I really wish we had a 2 way game mode option to work with, because there are days that I just want to get into a straight up brawl and not have to look over my shoulder for Adders/Mael coming to the rescue of whoever I'm trouncing.
