I always wanted a TG16 for Blazing Lazers and Dungeon Explorer, but could only have one console growing up, so it was the Genesis. I also didn't know anybody with the system, so it was always in my TODO list to get one once I "grew up".
In the late 90s, I was able to source myself a PCE Duo R, so I could play those 2 games, as well as the much talked about Dracula X. IMHO, Rondo of Blood more than lives up to the hype, as it's essentially perfect at what it sets out to do. It's got great presentation, fantastic level design and it is a decent challenge, without being unfair or frustrating; it's just fun to play. I'm not sure how people can be let down by the game, unless perhaps they were expecting 3D graphics or other unrealistic crap.
To me, this game and Lords of Thunder are reason enough to own a PCE.