The drainage system from the front windscreen got blocked on ours at about 25000 miles and the interior flooded, but I dont think thats common. The leak in the boot was fixed under warranty by the previous owners. A wheel bearing went at 24k. It was rumbling when we test drove it, but I mistook it for the exhaust note! That cost about £70 to have replaced by an independent (Renault wanted £180).
Sadly the 4k rattle has started (at 31k) so looks like Ill be replacing it with a stainless system as Renault charge about £550 for their poor quality mild system.
Oh yeah, everything rattles! But it did that in the MK2 as well, and that had a lot less miles on it.
Thats all I can think of. Generally been pretty reliable (fingers crossed).