Most of the PS2-to-PSP games have been retooled versions of an existing title, usually cutting some content and adding new bits here and there to justify the re-release. With Medal of Honor Heroes, you're getting the same head-rocking sound effects and attention to detail the console games have enjoyed, but the insane online action distinguishes this one from the rest.
The idea of a 32-player fragfest isn't new, but being able to do it from the tiny PSP is novel indeed. You can check out our impressions here, but all you really need to know is that online is the way to play Heroes. It's not revolutionary or groundbreaking in any way, but it's totally solid and carries over the PS2 games' commanding presence perfectly. All the standard online modes are here, but knowing there are so many other players jockeying for the lead, all on this miniscule handheld, is the one unique feeling the game can offer.
And for what it's worth, that's just enough to make Heroes worth diving into. Online multiplayer is hard to put down due to its sheer level of disorienting chaos, but when going solo, you're in for a very familiar, competent shooter. This one follows the trends set by European Assault, so you've got big yellow icons constantly directing you towards objectives and flashing icons to tell you, "Hey there's health over here!" Previous games in the series ferried you along a linear path, so there wasn't such a need for glowing markers - you just saw a pack and knew it was health.