Not to mention the RX7/RX8.. (Given we are talking about "rotaries")

Well, you picked the other company that is most known for an extremely fun relatively affordable car: the S2000 :)

I feel like neither Mazda nor Honda are appropriate here, anyway.

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).

Also, the NSX is a Honda in most markets, as was the TSX, and both were more exciting than the average Acura.