[Kalyx triaD]

8bit:

TMNT (NES), Rescue (NES), Zelda (NES), Marble Madness (NES), Double Dragon (NES), Mega Man (NES), Ninja Gaiden (NES), Castlevania: Simon's Quest (NES)

16bit:

Mario Kart (SNES), TMNT: TiT (SNES), Sonic 2 (Gen), Donkey Kong Country 1/2/3 (SNES), Super Street Fighter II (SNES), Ultimate Mortal Kombat 3 (SNES), Street Fighter Alpha 2 (SNES), Shinobi 2 (Gen), Super Double Dragon (SNES), Mighty Morphin Power Rangers (Gen), Mighty Morphin Power Rangers the Movie (SNES), Super Contra (SNES), Star Fox (SNES), Mario Paint (SNES)

32bit/64bit:

Metal Gear Solid (PSX), Anything from Rare (N64), Zelda OoT (N64), Tekken 3 (PSX), Soul Blade (PSX), Virtua Fighter 2 (Saturn), Rival Schools (PSX), Resident Evil 2 (PSX), All Aki wrestling games (N64), Turok 2 (N64), Winback (N64), Fighter's Destiny (N64), Bushido Blade (PSX), Mario Party (N64), Smash Bros (N64), Silent Hill (PSX), Star Wars Rouge Squadron (N64), Final Fantasy VIII (PSX)

128bit:

Soul Calibur (DC), Power Stone (DC), Street Fighter III 3rd Strike (DC), Rival Schools 2 (DC), Star Wars Rouge Squadron 3 (GCN), Eternal Darkness (GCN), Halo CE/Halo 2 (XB), Dead or Alive 2 (DC), Dead or Alive 3 (XB), Tekken Tag (PS2), Capcom vs SNK 2 (PS2), Metal Gear Solid 2/3 (PS2), Devil May Cry 1/3 (PS2), Tekken 5 (PS2), REmake/Resident Evil 0/Resident Evil 4 (GCN), Soul Calibur 2 (GCN/XB/PS2), Spider-Man 2 (XB), WWF Day of Reckoning 2 (GCN), WWE Smackdown! HCTP (PS2), Tony Hawk Pro Skater 3 (XB), NFL Street 2 (XB), Guitar Hero 1/2/80s (PS2)

HD/Motion Era:

Halo 3/4 (360), Tekken Tag 2 (360), Soulcalibur 4/V (360), Street Fighter x Tekken (360), Sonic Allstars Transformed (360), Rock Band 1/2/3 (360), Guitar Hero 3 (360)...

Gonna stop there, listing current gen favorites would be redundant.