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…
991 to 992 is not a facelift. 996 to 997 is not a facelift. What is going on?
OP doesn’t know how Porsche works
To be fair, to the average person Porsche has just been facelifting the same car since they’ve existed