I’ll start with the Porsche 997, the 996 looked alright imo, but it looks “like a 90s Porsche”, the 997 made it look sleeker and more modern. Still looks good today.
As for cars that looked worse after a facelift? Maybe the facelifted 6th gen Camaro? The 6th gen looked great pre-facelift, but they did something weird with the headlights and now it looks so-so…
Some companies like Audi and Mercedes don’t really do facelifts because they didn’t mess up the first time. Usually BMWs look worse after facelifts (eg. E46, 7 series when they slapped the big grille on), and some companies like Toyota always plan for very dramatic facelifts.