Pressing up to jump in a fighting game is fine. In a side-scrolling game, not really. Plus the controls in PCE Altered Beast (either version) are pretty crappy. I'd also rather press an actual button instead of an oddly-shaped RUN button for an in-game action other than a menu or pause. Tactile feel is everything. That's why people don't like controllers that feel like crap. People who don't mind probably enjoy virtual buttons on mobile devices.
Also, as long as you remain in human form you can get past level 1 in PCE CD Altered Beast.
To be fair the controls/gameplay in
Altered Beast are crappy. It really depends on the game when it comes to pressing Up to jump, but it used to not be uncommon. Maybe it's just too unusual for people who started playing games no earlier than the 16-bit generation. It works fine in Altered Beast because it's not really an action game and the slow pace and floaty jumps suit it. I don't think that Altered Beast is worth going out to buy an Ave 3 pad (or an Everdrive) for. But I don't find old games as difficult as many people seem to nowadays, so maybe I'm just weird (Pac Land plays great with no d-pad/joystick).
The Run button being used in Forgotten Worlds isn't an issue in the way it's usually made out to be, since you don't play the console ports of that game like typical thumb floppers do. You have one finger tip on it and another on the other rotating button at all times. No matter what, it isn't a traditional way to play a game and neither was the arcade's control scheme.
I agree that tactile feel is important and that's why PCE pads remain my favorite controller. But there are more people out there who think things like SFII is better played with SNES shoulder buttons than those who don't.