The worst things in my opinion are the daft spoilers that don't sit right or have led brake light in them, and when the exhaust doesn't even come out where it should...also I've seen one locally that has arches that are stupidly wide and look daft. The fibreglass bumpers are awful too, and also stick on bonnet vents!!!!

If you can get one where they have used proper parts and not cheap fibreglass copies then chances are it will look nice as long as its not been sprayed in a daft flip colour...that always gives it away.