Yeah, it would. Things with romantic interests without a homosixual one tend to get bad critique. No unbiased reviewer will say "I'm not playing this game because it has gays. Gays are bad." etc. Homophobia stinks.
Would an unbiased reviewer say "I'm not playing this game because it has no gay marriage option?" It seems your definition of "unbiased" means "agrees with ikillpeople".
Although, I suppose we should avoid this direction of the conversation altogether or some mod will get uptight about it, and there's no point in turning the debate political.
Like I said, smoking would be kinda pointless, regardless of your feelings about tobacco. Heck, kinda like marriage in the game, now that I think about it.