I am sure there a good and bad mechanics in both industries. In my experience my Honda auto dealer does far superior work as compared to the dealer that serviced my NT. Now some of that maybe that my Honda car dealer only sells and works on Honda cars while my Honda motorcycle dealer is a multi line dealer where the mechanics have to be familiar with all makes and models that they sell.
I've had excellent service from my local Honda auto dealer. Not so good with the Honda Motorcycle dealers I've dealt with. My mc maintenance issues started in '99 when I bought my first new bike, a '99 Kawasaki Concours, at Sun Motorcycles in Denver. It was delivered with 20psi in both tires even though the pre-delivery checklist showed 36/42 and was dated the day before I picked up the bike. Service blamed Sales. Then when I took it back two days later for the 600-mile check, I got it back with four fairing attachment screws missing and an oil leak that had not been there before. I let them do one recall and then told them I'd do my own maintenance.
When I bought my NT from Sun in '10, the salesman told me that they had completely changed service personnel and that they were proud of their service. They sold me a 4-yr extended service that included the first two services free. I was completely impressed with them up until the last 2-3 years. Prior to that time, they almost always could do a 1-day turnaround, which was very helpful. Until '14, I lived 80 miles from the dealership. When we moved to Greeley, that dropped to 50 miles, but then around '17, they started wanting the bike for 2-3 days for a full service. That meant that Joanne had to follow me down to Denver and then take me back.
Even though I had had difficulties at Wild West Harley, the Honda dealer here in Greeley, I decided to give them another try and so far they've done a good job. But they only have two mechanics who work on Hondas and one of them goes to Arizona every year after Thanksgiving and doesn't come back till mid-April. So, if I need them in that period of time, I usually have to wait a couple of weeks for them to get to me.