You may be confused as to why an arcade racing game would have so many driving aids. The reason is simple: The controls stink. The first group of vehicles handle more like boats than cars. You can try to feather the analog stick to gently navigate turns, but it's of little use when your car steers like an out-of-control aircraft carrier. Your vehicle can sustain damage that you'll have to pay cash to repair after each race. This is a real treat, given how easy it is to run into a wall. The rides you can purchase later in the game control a bit better--as do many of the cars once they've been fully upgraded. But you're not likely to want to spend the time necessary to unlock them, especially because in most of the events you earn money only for finishing first. To top things off, races are generally rather boring since you're racing against only three other cars, each of which is driven by the brain-dead CPU.
ProStreet's presentation is just as uninteresting as the rest of the game. The tracks and cars look OK, but they're not especially detailed and there's a lot of aliasing on both. Given there are only four cars on the track at a time, it's reasonable to expect them to look better than they do. It seems the developer's plan was to skimp on visual details and focus on delivering a great sense of speed. One problem: They forgot the whole "great sense of speed" part. Even a lousy blurring effect can't make these cars look like they're driving fast enough to get a ticket in a school zone. The music and sound effects are as dull as everything else and aren't worth mentioning further.
Need for Speed ProStreet for the PSP is chock-full of mediocrity. There's not one particular thing it does well, and it feels like nothing more than an egregious attempt to cash in on the Need for Speed name. There are so many other, better racing games available for the system that there's no reason at all to pick it up.