It's just my personal taste ( and many others ) that the best way to show off your car is by how clean it is. Altezzas belong on an Altezza. Simply put. You know something has gone overboard with the whole thing when you see them on a Chevy Astrovan.
Everyone has an opinion on what a "good" car looks like but the question is, do U like those tail lights ?
If U do, get them and put them on. It's your car and do what you will. If your worried about being outcasted from your clique or group of friends by putting them on, then take their opinions in to consideration. Otherwise, modify your tail lights and other parts of your car to satisfy your taste and personal desire.
Only opinion I can give is keep the sticker count low on your car and try to make your car unique so it's different from everyone else so your car stands out.