Short form:
Time Crisis: Project Titan is a blast to play, until you realize that you can beat the game in an hour or two. Then it seems to be a little too much like that wave of PS2 games that were all too short for their own good. It's fun while it lasts, but
Project Titan's main shortcoming is that it just doesn't last long enough.
For those of you who have never played a Time Crisis title--there were two in the arcades, the first of which was ported to the PSX back in its youth--the concept is fairly simple. Like most of the 'gun-based' titles on the market, a number of enemies pop up on the screen and you have to shoot them. Unlike most, you have the ability to 'duck' at any time, which both refills your ammo and keeps you from getting shot. The game consists of ducking out, firing a few well-placed shots, and then ducking for cover again as the bullets whiz by. Various enemies have various methods of destruction; some have pistols, others have machine guns, and others are much more careful aimers and need to be shot upon sight. If you get hit full-on by a bullet, you lose a 'life'; lose all of them and it's Game Over.
Of course, to keep you from wasting too much time ducking behind cover, the game has a constant time pressure that shows up as a timer. Hence, Time Crisis.
Project Titan is a PlayStation-only release, never seen in an arcade. Despite that fact, the game has very little in the way of amenities. You can pick whether you want to play the standard game or the Time Attack, and that's about it. In the normal game you're given a time limit for each level, along with however many lives you have; in the Time Attack mode you have as much time as you need, but you're trying to beat your best time.
And there is the main problem with Project Titan; once you beat the game, there's really nothing else to do with it. Sure, it's fun to perfect your style, trying to make it through without getting hit even once, but that wears thin pretty quickly too. Even the PSX release of the original game had two 'episodes' that you could play, one special-made for that release.
That's not to say that Project Titan doesn't have a few enhancements. The environments are more interactive, letting you break glass and do other fun stuff. And during the boss fights you have the ability to scamper between different points of view, each of which lends you a different angle to hit the boss at. More often than not it's necessary to get a good bead on the bad guy.
Now if only the game lasted a few more hours . . .