Ugh. Please, god, no. You are among a very small minority that actually likes classic 2D games being remade in polygons.
Really? I rather like 3D conversions--they're infinitely scalable, both in resolution and framerate. Raster-based 2D games are problematic--as display standards change, their flaws become more apparent, or new flaws are introduced. (The thread regarding retro consoles and HDTVs comes to mind.)
Vector-based 2D games, on the other hand, are scalable in resolution. Tweened animation can be scaled by framerate, too. This type of art tends to get a bad rap because of the proliferation of shitty flash animation, but it can look gorgeous if done properly.
Despite all this, though, I know most people prefer the economy of the original art style. I'd be happy if more retro HD ports were done like the recent Sonic CD release--an expanded viewport, a better framerate, comprehensive filtering and sound options (scanlines, pretty please), and all of the best features of every release of the game (plus some new ones besides.) Instead of a full remake, a "definitive" release of the original would suffice.