A lot of new cars have problems these days, you just have to look at how poorly new Mercedes feature in things like the JD Powers survey!
I think the problem is down to vehicles being overly complex. One thing with Renualts is that they tend to come with a lot of kit for the money - lots more things to go wrong.
I've only ever owned one Renault and I was very pleased with it despite a few problems, all of which were dealt with under warranty. Having said that I wouldn't own one without a warranty and ended up selling it before it was three years old for just that reason.