Most loved:
Playstation. Tons of ground breaking games. FFVII, Gran Tursimo, Metal Gear Solid, Soul Blade, Resident Evil, etc. Bought my PS 2 days after US release (9/11/95) and still have it! My brother and I played the heck out of Ridge Racer for the first month.
Most hated:
Gamecube. Bought on release date. This was a real disappointment in the long run. So few third party games worth playing, no network support, etc. (Yes, I know PS didn't have network, but the gamecube's contemporaries did...)
BTW, both haven't aged well when viewed on HD screens. PS1 looks good on PSP though!