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…
Pre-facelift VA WRX looked like a Camry. Post-facelift looked mean like an Evo.
I actually like the pre-facelift Lexus IS more with the separated headlights and DRLs, felt more unique. If you take away the hourglass grill it kinda just looks like generic luxury sedan