I didn't mind the love triangle, because to me it sort of seemed like a subversion. Sure, there's the model: 1 girl (Katniss) and 2 guys (Peeta and Gale), but there wasn't ever really a competition.
From memory:
Gale and Katniss were best friends from childhood. He liked her but it took her too long to realise she might like him back. Peeta adored Katniss, but she never really felt anything for him until right near the end, much of the "love story" is just that, a story for the masses who are watching the game so that the may win public favour. Peeta doesn't quite know this, but essentially Katniss is using him, and she feels bad about it.
Gale has moved on to another girl (I think?) by the time Katniss gets a chance to possibly be with him, because he thought the thing with Peeta was more than just an act, and even with definate knowledge it was all fake his feelings have already changed, so it's too late.
Then she spends a long time just focusing on the war and keeping her family alive, she even gets frustrated at Peeta's insistent romance sub-plot, feeling guilty for using him earlier and that she owes him something, but at the same time she's just not looking for romance at the time.
I got the impression that at the end of the book it wasn't so much romantic love that Katniss and Peeta got married, but that they were the only people who could understand the hell they went through, and that after losing much of what she loves she needed someone to take care of her until she could get back on her feet again.