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…
I’m partial obviously but the 9th gen civic si got a facelift in 2014 and I think the sedan looks a lot better: gave it bigger rear taillights, front and rear bumper look a little better, and a new exhaust that breathes a little better (and sounds better).