I think the earlier models had issues with the bottom of the doors rusting but should be all fixed in the facelift.
Only real issues I've had on mine is the passenger side wheel bearing failed (its done a lot of miles mind), an air intake pipe split (cheap fix) and the rear bumper was sagging.
Handily someone went into the back of me so they sorted my bumper and gave me a nice new shiny exhaust as well
I can't really think of any major common problems, check the rear suspension and expect any cars on factory alloys to look pretty tatty as they corrode like anything.
Otherwise just get one that has been looked after.