>>12102701590% of the time, that's really all the character is. If they're LGBwhatever, then it usually overshadows the living FUCK out of the rest of the character's writing and makes them VERY one-dimensional.
Sure there's exceptions, but it's almost always like that.
Also fuck when they do the last-second, last episode of the franchise lesbian/gay kiss. It's almost always shoehorned into a finale that really could've used that long drawn-out makeout's screentime for something more important, like tying up actual plots.
Double-fuck when they have a character show zero interest in the same sex for the whole series, then do the lesbian/gay kiss.