Not really, in the same way i don't wanna see more heterosexual main characters, since the gameplay hardly ever focuses on romance/sexual attraction, the characters sexual preference really doesn't matter in most games i play, and i would prefer, that it didn't become trendy, to inculde dating-sim elements in games.
If/when they include them anyways, i really couldn't care less whether the main character liked girls or guys.
Isn't there already 2 army of two games out btw?
If it's just part of the plot for the game like "Mario must rescue his belowed princess peach" and deson't affect gameplay, i don't mind the fact that the character is motivated by that kind of stuff, and it wouldn't really change the game if he had to save some dude he had a crush on instead.
I liekd No more heroes, and it was kinda fitting, how travis was trying to get laid by that chick, but it was all in teh story/cutscenes, and didn't affect gameplay, so if he had been trying to get with some dude instead it still wouldn't have changed anything.
Long story short, i prefer the sexuallity of the game hcaractrs to have as little impact on teh game as possible, cause otehrwise i'd be playing dating sims instead, so it won't make any difference if teh protagonist (or any other character) is gay or straight.