Fantastic scenery but inadequate infrastructure. The key lifts [e.g. Parsa at Brevent] and Grand Montet are woeful.
Huge crowds/very slow/too expensive. I will never fail to be be captivated by the beauty of the place but after ten years of going three or four times a year I have realised that the customers are being taken for mugs. Definitely visit if you can get there, but only in a quiet period; avoid if it's a busy one!