Still (and always did) think it looked ****.
Quake 4 is a mess of harsh lighting/contrast, high res textures on low res geomery, low res textures on high detail geometry, everything looks plasticy even more so than doom3.
But yeah I'd love a proper highres remake (not "HD" remake thats basically crappy geometry with overly bump mapped textures/shiny shaders) of Quake actually - I replayed it about a year ago or so and had as much fun playing through it as I did when it first came out and while the graphics are quite low res they are nicely detailed and fit in for the most part.