We all know by now that the portable PlayStation is missing some key features (like that whole second analog stick), but the developers have done their darnedest to work around these deficiencies, with mostly successful results.
Mostly successful, we say, because it still doesn't work as well as it would have on a console with two analog sticks. Yes, you can strafe with the d-pad, but when combat gets really frenetic (as it always does in these games), it doesn't work nearly as well as the standard third-person-shooter controls of the game's predecessors. This applies to the four-player multiplayer portion especially.
Speaking of, the multiplayer stuff is really solid, offering a variety of game types from the standbys like Deathmatch to the new Iron Lombax, a team-based game that gives you different objectives depending on the map and pretty much lag-free gameplay. Another team mode we liked was Mega Cannon, which has the team racing to assemble a gigantic laser turret and then use said death ray to blast the opponent's big gun to bits. And then there's the one where you're packing cows into boxes in a meat plant... we'll leave that for you to discover.