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…
It’s ironic how this post is coming after the new Porsche panarama, that’s the one that looks the worst and I think the new e class looks better then the last generation. The last one looked dopey to me because of the headlights and I ‘think’ maybe because of the hood