No, that's not an excuse.
I know nothing about Gears of War and not interested at all in it. You know what I do when I see its thread pops up? I don't click on it. If for some reason I become interested enough to click on it, I'd read the entire thread or at least some pages of it. If after that I'm still interested enough to even want to know more or comment on it, I'd certainly wouldn't post "you know, people, I have no idea what this game is" and leave it at that, as if I was incapable formulating even the slightest of logical thought and had more interest in seeing my own post up there rather than the actual thread subject. And that's just a game, not a subject I actually know is charged with a lot of tension.
Because it's basic courtesy.