I get what a lot of you all are saying about reviews, but I wouldn't disregard them completely. You do have to read them critically though. Some of them you have to just ignore (generally the extreme positive and the extreme negative ones). But, the information is there in the 2-4 star reviews if you look for it. Look for comments that show up repeatedly. Look for replies by the dealership....what did they say, how did they say it, etc. You can get a feel for what kind of operation they are, but you have to read between the lines. Salespeople are good at showing you what you want to see so this "after the sale" information is helpful. One caveat....there have to be enough reviews. If there are only a handful, there's not much that can be interpreted from that. The significance of the difference between a 3.7 star review and a 4.7 is zilch if it's based on (10) reviews. If it's (100)....that might mean something.
Obviously this is for the analytical crowd (like me), which the OP might be. I get the handshake and eye contact aspect and agree that's more important...but the reviews CAN be useful.
A quick simple example....I'm shopping for tractors now and narrowed it down to a couple so I started looking harder at the dealer. Checked the Google reviews and one of the dealers was slightly lower in rating (not enough to matter, but it got me looking). What I quickly found out was that most (if not all) of the negative reviews were for their landscape business. My point....you can't stop at the number.
Best of luck in your search!