There's no winning with gamers these days.
Upscale the older games with HD and add achievements/trophies: gamers love it or hate it because it's not a "true remake"
Completely redo the visual style and actually put some effort into the remake ALA Wind Waker and Halo: Combat Evolved Anniversary: Gamers love it or hate it because it gets rid of the thing that made the original game great.
MAKE UP YOUR MINDS GAMERS