I've had a single-layer MSI DVD burner for a good few months now. The DVD's I've used are TDK (expensive but good) and Infiniti (cheap and good). Only had one dud DVD, but that was me screwing around trying different things.
I've tried both +R and -R and had absolutely no probs with either. They all played on my PC, PS2 and a mate's DVD player perfectly too :-)