In an interview with Edge, Codemasters Exec. Gavin Cheshire expressed frustration with Sony's PSP and the users experience;

Asked about the handheld’s future, he told us: “Well, speaking as a person who bought a PSP, the problem was that I always thought, because it was a better screen than iPod’s, that I’d be doing more with it. But it was such a bollocking useless waste of space; just getting stuff on it was ridiculous. That was its downfall.”

When asked about the PSP Go he related that one of their senior VPs bought one day one, and then spent the day on the phone with customer support to get it working.  The feeling at Codemasters is Sony hasn't gotten it right yet and that, "Stuff like that will make people leave it alone."

Asked about Natal and PlayStation Move Cheshire said they have ideas for them, but nothing planned right now.  He went on to say that adding those controls to games currently being developed would be a bad idea.

"I’m sure there’ll be games attuned to Natal and that’ll be great, but what you can’t do is back-engineer it into something you’re currently doing. And that’s where it’ll fail. There are a lot of companies saying they’ve got Natal stuff coming, but it’ll be bolted on to something they already had in development, probably."

I have to agree, nothing worse than a system tacked on just to have it in there.  As far as the PSP is concerned, in my opinion it's still looking for that must have quality.