PDZ was the first game I got, it's hard to get into, the graphics are good but cartoony so a lot of people don't like that. the controls are hit or mis, in First Person view It's great and plays like any other FPS, but whenever you dive, or roll, or hide against a wall it zooms out into 3rd person and I found the games management in switching between the two views very clunky.
Playing through the first two levels on normal difficulty I was kind of bored and frustrated, even the menu system leading up to the gameplay was confusing as hell (not to mention kind of ugly). But I gave it a 2nd chance, cranked up the difficulty and did local co-op with a friend, we played through to level 4 or 5 and it was fun as hell. Once you get used to the game mechanics and get further into the single player it's much better IMO. I haven't played much past that as I've been distracted with other games, but I still have it and I plan on going back and finishing it at some point (just too many games to play right now).
I'm not much of a multiplayer fan, especially with FPSs but I tried some, Online was a ghost-town when I tried. No one was on the servers. I went into a game with only 2 other people and the level was HUGE. It was still really fun though we were all sneaking around making stealth kills on each other. I can see it being enormous amounts of fun with any amount of players. I even tried setting up a multiplayer match with nothing but BOTS and that was really fun as well. I thought the AI was decent.
It's not a typical FPS, I'd give it an Honest 7.5 (based on my raiting system:
http://forums.xbox-s...howtopic=506483 ) because it does have a few problems, but overall it's a good game and if you're a fan of the old N64 Perfect Dark I think it does it justice.
Don't bother with the LE version, it doesn't include anything really that special, I'd say only get it if you really like LE metal boxes (like me

) All the extra disc has is some gamer pictures and behind the scenes features, theres no extra game content to speak of.
I'd say it's definitely worth $30