You cannot use 'ratings' for these issues... ANY dealership, each with 5,10 different Service Advisors, can steer you wrong. Some are honest, some take just a little advantage and some really sock it to you. When I said ESL it wasnt to denigrate YOU- it was the observation that a predatory SA will look at the entire package- communication skills, body language, car aptitude, etc- even gauging your comfort with confrontation- and then decide how they can push you.
I get fine service from the dealers Ive used. (Excellent at one) but that is because I drive the process. ANY of these - if allowed free rein- could be abusive.
In terms of "buying experience"...I can GUARANTEE you, the experience **I** get will be different than yours, and different that mzn2000's. Your best bet will be to contact a forum sponsor, IMO.
Keep it as simple as possible...but no simpler.