It's the worst because the weather is never perfect enough to drive it.
Seriously though, for me it was a 2002 Volkswagen Jetta 1.8T
Two ignition coils blew out
Then the other two AFTER we fixed the first two
The transmission was slowly killing itself
The sunroof switch was busted (apparently that is a $1,400 fix too)
All at less than 65,000 miles
The CEL went off miraculously for the transmission and we sold the s*** that day