Good Lord. It's everywhere. If it isn't the MC it's a subplot. I hate them. Hate 'em, hate 'em, hate 'em.
I'm trying to figure out what is appealing about the love triangle. Obviously, many women/romance readers dig it. Two strong heroes fall all over themselves risking life and limb to protect/save/rescue the foolishly spunky gal who's up against more than she bargained for. Is it incredibly romantic to have a heroine with two wonderful specimens of masculinity pining over her while she wrings her dainty hands in indecision? She knows she's hurting them both but she simply can't choose because...why, again? Oh, yeah. She can't bear to hurt one of them. What?
Let's flip it. Two lovely ladies hotly pursue a male protag who loves them both. They compete for his affection. In the spirit of the trope, let's go with the most adorably feminine counterpart to fisticuffs and rescue of the heroine. One bakes him her state fair winning coconut chiffon cake. The other joins the DAR to buddy up to his mother. The first one strikes back by learning how to hunt. (She is just adorable hoisting that rifle up like she might really shoot something. Aw.) The other takes up fly fishing and learns to create her own lures. Would ya look at that? She's so good at it she starts her own online business selling lures.
So does this make the hero a tragic figure torn between two soul mates? No. It makes him an asshat who's stringing along two women at once. And the women both deserve him because they are idiots.
Maybe that's why the love triangle annoys me. It's vaguely misogynistic somehow, like women are too flaky to make a decision and go with it but we expect men to know their own minds and hearts. On the other hand, Hamlet couldn't make a decision and I didn't like him either. Guess I just don't go for wishy-washy.