Honestly, a lot of the arguments against the PSP here seem to be more out of anti-PSP/anti-Sony biases than solid reasonings. The PSP itself as a system has done remarkably well. Just today, Famitsu reported that PSP sales have surpasses the DS in Japan this year - and yeah, the DS definitely is still in the lead, but considering the monopoly that Nintendo has enjoyed since... well.... for a very long time, to not just survive but to prosper and make a dent in the handheld industry is definitely considered a success for Sony.
At the same time, the DS and PSP are pretty different systems (just like the Wii and PS3 can be considered rather different, both in style, audience, etc.) - if you're not a fan of the PSP, well... to each their own. I own both and definitely enjoy both - although I use them in different ways and for different games.
That being said, back to the original issue - despite the simplification of the game, the controls are still fairly complex (in respect to its use of several buttons). The PSP would suffer trying to catch all of that. The DS, with it's touchscreen opens the door for flexibility in controls. Either way, I definitely would pick up the game if it was out for the PSP.