Nothing wrong with the port I think. All these ports are technically perfect. People are just hating on the game itself (Ecco).
I bought all of the first wave except Altered Beast, and Ecco is by far the one I played the least. So I'm inclined to agree.
I take issue with ranking Sonic and Shinobi lower than the arcade games though. They're perhaps less technically impressive (for obvious reasons), but I love them and enjoy them just as much. They also provide very different gameplay in terms of difficulty, length, and pacing being console games and not designed to be twitch-action quarter-munchers.
I'd rank the ones I bought as follows (subjective ranking):
Tier 1: Super Hang-On, Galaxy Force II, Sonic, Shinobi, (Outrun and Afterburner will go here most likely but I didn't play them yet)
Tier 2: Streets of Rage, Space Harrier (putting this here will be sacrilegious for many people, but I'm not a big fan of the game. It looks and runs great but I find the gameplay very simplistic)
Tier 3: Ecco