Well, I can nominate:
-Advance Wars (series): I quite like this series. Played all four games, liked them all, liked the characters, the stories, I've commented recently that I would like an Advance Wars 5. Yet, this doesn't offer me much to talk about. The characters are broad archeatypes, and the stories are fine, I guess, but nothing special, and certainly the "Wars World" setting is bereft of any real worldbuilding. The only exception is Days of Ruin, but it's hindered by many people considering it the black sheep of the series, and while I'm not among them, even then, there isn't too much to discuss.
-Battlefield 2: Favorite Battlefield game, but, yeah - what's there to be said? The US, China, EU, and MEC are fighting each other because of...oil, I think? I dunno - looking at the maps I can infer that's the reason, that the US is invading both China and the MEC (in that they're always the invading side when the map allows for that), and whatnot, but, yeah. Not really much to say.
-Doom 3: Yep, another black sheep (you'll see a lot of black sheep on this list). Now, it's no secret that Doom 3 is my favorite Doom game, anymore that it's no secret that it's an installment that most people don't hold in high regard. But even then, there's a lot I can say about Doom 3 in of itself (mostly good), but to actually discuss? There's...not really anything. There's no deeper meaning, no themes, no particuarly interesting characterization...Doom 3 carries itself to me on its gameplay and atmosphere more than anything else. The former is moot to this thread, the latter is something that doesn't bear much weight. It's an interesting take on how a Martian base would actually operate in the 22nd century, shows how hostile Mars itself actually is (and by proxy, how alien the demons are by being able to exist on the surface without any ill effects), and contrasts the two well when Hell 'bleeds over'. Good stuff, but not something I can discuss at length.
-Gears of War (series): This is an odd one. I mean, there's a lot I can discuss about Gears, but that's only if I factor in its EU material, and unless I'm on a GoW site (I've long since given up visiting specific fan sites for discussion for various reasons), I can't count on people to be up to speed with it. So, taking the games by themselves, there's not much to talk about. Gameplay is good. Characters are good, plot is simple, but decent, but, yeah. Not too much to say if I take the games by themselves, and that's something I'd have to do most of the time in general conversation. Halo is similar, but the Halo games, if taken in isolation, do give me far more 'meat', so to speak. Gears is certainly a fleshed out setting, but the average player won't be exposed to it.
-Heroes of the Storm: Love playing this, but lore? Yeah...not much outside head-canon.
-Perfect Dark (series): Apply everything I said about Gears in regards to the "EU-only" material, and you see the same problem. Doesn't help that this is effectively a dead series, and that I get the sense that Deus Ex is the setting that most would prefer to talk about, even though both games started off at similar times, based on similar ideas.
-Torchlight: Well, I like this game. It gets a spot in my top 10 RPG list. But only because of the gameplay. The story/setting is pathetic. Like, astoundingly pathetic. It's always boggled my mind that it was D3 that everyone lambasted for its story, yet it was Torchlight that never got a whif of criticism. And I know it might seem strange to criticize story in an ARPG, but for God's sake, Diablo I did it over a decade before, and did it better. The only thing worth discussing is the 'layers of civilization' idea, and I'm probably giving the game too much credit in regards to that.
Like I said, like this game, but only for its gameplay.
I'm sure I can name others, and I'm not counting games that I love but can't discuss because they're so obscure (e.g. Marathon), but, yeah. There you go. Also helps that I can often find something to talk about in at least one of the five elements of story, so there's that I guess.
Edit: I guess I can also nominate Super Mario 64 and Banjo-Kazooie, because as good as those games are, there's not too much to discuss on the story front. And yes, I'm not including Sonic, because there actually is some stuff to discuss there (ducks flying object).