I suppose it depends on 'why' you want to be noticed on GAG. It's pretty easy to become noticed an remembered as a useless troll - just answer everything with useless information and poorly thought out replies.
Personally I think it's better to become noticed for being an articulate, considerate commenter, but that takes a lot more time and a lot more work.
If you want to be noticed so you can develop some kind of friendship or camaraderie, then that is also something that will happen better over a longer period of time. You'll find there are people that have a similar point of view than you, than may simply have a different set of experiences, or be coming at them from a very different background, and those will be the people you will start noticing in various comment threads. You'll find you are saying similar things a lot, or that you are replying to their comments a lot, or they are often replying to yours, both backing each others points up. Or maybe you won't be commenting on the same things, but you always find that you want to read what they've been saying, because it's interesting or they bring up points you may not have considered. It will take time to notice those trends, generally, but when you do, drop the person a pm. They may be willing to talk about other things, it may be nice to talk about things that aren't phrased in the form of a terrible dilemma.
So... yeah... I'm rambling. But the point is, the way to get noticed depends on what you want to be noticed for.