The big problem with the 1.9 dCi is
failure. It seems to be at least somewhat avoidable with good maintenance and far more frequent
changes than Renault recommend... But you can't know the precise history of the vehicle unless it's all documented. I'd certainly be looking elsewhere if bulletproof reliability and a diesel engine are what you're looking for, unless your budget stretches to a facelift 2.0 dCi model. The 2.2 is on balance, probably better than the 1.9 for reliability, but it's not without its issues (Personally, I think the biggest problems with these have been caused by people continuing to drive them after they lose
pressure due to cracked inlet manifolds - every fault description starts with pressurisation of the
system, some were solved with a change of the manifold, some resulted in big end failure! But it doesn't sound like there was any adequate warning.)
The electrical problems are not as bad as they might seem, the solutions to the common ones are all on here and not too expensive. The suspension seems fault prone, but then so do all modern cars - I think it's just the state of the roads.