Why do people keep bringing up Symphony of the Night in any kind of discussion where "2D is always better than 3D!!!!" Here's a true story: no 2D Castlevania will come close to matching Symphony of the Night, ever. If you think Aria or DS are close, then you didn't know about all the stupid shit hidden in that game. Cuz, man, there's a lot. And that's what makes it good. And even if 3D Castlevania was as good as Devil May Cry 3, which itself remains the best action game ever, 2D or 3D, it wouldn't be as good as SotN. SotN is an exception to the rule of 2D/3D stuff. It's better than any of that, and will forever be the best Castlevania can ever be, forever and ever, amen.
Also, 2D kinda sucks. I have no idea what people are talking about when they think it's "better," and then cite the Neo Geo??? THAT piece of trash is why games are better in 2D?
There's some genres that work better in 2D. Like, 2D Fighters. They're different than 3D fighters, completely. 3D fighters are high-mid-low guessing games, 2D fighters are about tricks and silly crap. The most basic of 2D SF strats, "the fire ball trap," doesn't work in 3D games, there's an easy answer. Sidestep, fireball trap is worthless, projectile characters are crap. And, instead, they're based off of more intelligent guessing and baiting high or mid, instead of "here's a fireball, whatcha gonna do??" Not that Neo Geo games have ever had that problem, all of them neglect intelligent play in favor of stupid rushing forever.
Traditional shooters also work better in 2D, because they're meant to be cheap and 2D helps out a lot. Not every shooter can have the budget of Gradius V, but they can do their job without it. Not to say the same thing couldn't be better if it were done in polygons, but most shooter companies can't afford doing it, so 2D makes the most sense. It's a cost issue with those.
But, most of the time, it's more nostalgia's better than the truth, with 2D. Saying Shadow the Hedgehog sucks is one thing, but thinking the original Sonic games were some pinnacle of 2D engineering? Sonic Heroes, without the bugs that caused pitfall deaths during non-interactive sequences, was pretty much "OLD SCHOOL" sonic. You run, you remember when to jump at a certain point so you don't run into spikes or monsters, repeat. I think the 360 does a good job of pointing out how old games are trash, in that Geometry Wars Evolved is so much better as a shooter than Smash TV and Gauntlet could ever hope to be.
And Gauntlet really, really sucks. The whole game is mashing "shoot" button, BUT INTELLIGENTLY!!!
3D shouldn't be applied to all franchises as an improvement, sure. There's no way to make Castlevania better than SotN, and there's no real way to make Mega Man better either. MML/Rockman Dash was really good, but not as a Mega Man game, but as something different; MMX7 & 8 sucked at 3D because the franchise wasn't really well equipped to handle any kind of change of dimension. Same with Makaimura (Maximo is NOT Ghosts and Goblins, no matter how "hard" you think it is), Goemon (all 3D Goemon games were trash) and Street Fighter (actually, SFEX2 isn't that bad, it's pretty good for an SF game, but the stuff that's broken is realllllllllly broken).
I think 2D on consoles is dumb. There's no point in wasting money on a game that won't sell in either territory just to make sprites look pretty. 2D is what handhelds are for, and where good 2D still exists. There's a market for ports of ports of 2D shooters and fighters, sure, but real 2D games have handhelds, and that's really to reason to own them. And also another reason why handhelds have had the most amazing games the past few years. If you think "GUH SCREW HANDHELDS I WANT SUPER HI-RES SPRITES WITH FEATURE QUALITY ANIMATION BLAH BLAH," then you're a moron. Even SotN had to steal half its sprites from Dracula X, and GGX2 certainly has a bunch of badly animated hi-res sprites, the cost of creating such a game would be so high, it may as well be released as a movie.
Let the 2D dream die. Keep 2D sprites for fighters and shooters, when it'll actually make an impact when they're released. Embrace polygons. They're doing amazing things with them these days (I hear the Rockman X remake is pretty rad...).