I bought a new Triumph from a Yamaha/KTM/Triumph dealership in 2000 in Issaquah and it was pretty smooth, they were decent after the deal to, I got to rip around town on a Speed Triple loaner while they did the first service but I see on Google that they have less than 4 stars. My only knock was it turned out to take considerably longer than it should have, but again, ripping around on a Speed Triple, so ok.
I bought my new KLR here at Black Hills Powersports in 2008 and the sales experience sucked, the sales manager was a total dickhead and I will never ever buy there again, or recommend anyone else do it. I do have to say that their service and parts departments are decent and they do have a couple decent sales guys, but the sales manager was bad enough to stop me from purchasing a bike there again, ever. They deal Yamaha and Kawasaki.
I'm not sure where all the attitude comes in, like we need them more than they need us. It seems infused in the vast majority of motorcycle showrooms. The world will be a nicer place when it all gets done like Tesla and manufacutrers sell their own products from their own factory owned/run/maintained locations without sketchy dealerships.
That being said I'm not sure Yamaha is any better or worse than others but I've had enough. Pre-owned private seller only for me from this point forward. If I need to I can get decent financing through my credit union. I'm not playing games with these clowns anymore. All the deception, attitude and exorbitant dealership fees. I'm out!