TF PSP version: What was the problem again?

I bought the PSP version of the TF game, and, to be honest, I'm quite satisfied.
Which leads me to my question: What's with all the negative attention?
The graphics are good for a PSP game, the controls are nothing special, but they work, and I can have fun just transforming back and forth for hours. Even though it doesn't have the length of a Final Fantasy, it has plenty of missions.
Oh, and Steve Blum does the voice for Trailbreaker. That's an added bonus.
So what's the problem?
Which leads me to my question: What's with all the negative attention?
The graphics are good for a PSP game, the controls are nothing special, but they work, and I can have fun just transforming back and forth for hours. Even though it doesn't have the length of a Final Fantasy, it has plenty of missions.
Oh, and Steve Blum does the voice for Trailbreaker. That's an added bonus.
So what's the problem?