I nominate Acura as the nameplate with the least fun to drive cars.
I nominate Buick.
Dacia all the way
(not that they're bad cars)
Acuras aren't bad cars. In fact, they are quite good. Comfortable. Well-designed. Efficient. Reliable. And incredibly boring (except the NSX, of course, but that doesn't really count because it is so utterly unlike all of the other cars in their lineup).
I feel like neither Mazda nor Honda are appropriate here, anyway.