It is easy to make a good argument that the TG16 "sucks" but I think it's irrelevant. I didn't buy a TurboGrafx in 92 because it was the best system out there, and I sure as hell didn't buy it for Keith Courage. I bought a TG because it was an alternative to the Mario/Sonic/Final Fantasy stupidity that the rest of the country was obsessed with. I wanted to play weird games I knew nothing about and my friends didn't own. I missed the days of 1988 when there were only 3 Funco stores in the whole county and people didn't spoil RPG endings or practice for days until they could beat me at Mario Kart.
Yes, there were plenty of awesome games and accessories that never made it to the US, but imports weren't easy to come by back then. Living in 2007, PCE software isn't bad way to go and is definitely cheaper, but it's matter of personal taste. I've grown used to the campy US artwork (with the exception of Takin It To The Hoop). It's what I grew up with and I'm more comfortable playing my games in English.
The TurboGrafx was never graced with Street Fighter 2 or Castlevania, but remember that none of us ever got MK2 or Doom. If it was our priority to collect as many good games as possible, there is plenty to keep us busy on the current systems as well as the SNES and Genesis. Those games are easier to acquire and cheaper than PCE software. If I thought the TurboGrafx sucked, I wouldn't move on to the PCE! I'd abandon both systems and find something that could offer me 4-player racing games and first-person shooters.
I would argue the reason greybeards like us play these lame, ol' consoles is because we love strange shit like Motoroader and Kabuki Itouryodan. In this respect, the TG and PCE both provide plenty of options. Finally, Castlevania is compatible with whatever region your deck is and distinguishing between systems is stupid.
So, to summarize: anime sucks, English rules and "everything else is just gibberish".