This. A million times this.
I always listen to what people have to say with regards to cars, both in terms of the vehicle itself and also any associated service, but I'm also confident enough in my own assessment to make my own mind up sometimes.
"350Zs are plasticky and the service is awful!" A common complaint. However, whilst they're spot-on about the former (and anyone who says different needs to either put some glasses on or take off their rose-coloured ones) I had absolutely no issues with my local dealer at all, and in fact I'd say they were probably the best dealership I've ever dealt with in my life so far. I genuinely don't have a single complaint to make against them, they're that good.
As Sarnie says, there's a lot of nonsense bandied about when it comes to cars: Some of it is true, some of it is exaggerated, and some of it is nonsense. Listen to opinions, take it all in, but make your own mind up.