The problem with the sink rate on Tri-Pacers/Pacers is that it is different if all you are used to is Cessnas. In the big scheme of things, it's really not all that bad. My experience as a student landing the Tri-Pacer vs. the 152 didn't scare me away from Chuck's Tri-Pacer and later his Pacer. I never learned to land the Pacer but did get a few hours at the controls.
No plane is perfect, they all have their quirks. Flying and enjoying them is mostly a matter of learning the quirks and adapting to them. I would rate the Pacer and Tri-Pacer just as much fun to fly as a 172, which is to say, not quite as much fun as a 150/150.
