If you like Matlock/Any layer show, and CSI, and you own a DS? Buy "Phoenix Wright: Ace Attorney!" If you mixed Matlock with CSI and gave it a shot of Anime, you'd get this game.
Me I freakin' love mysteries, and that's what this game contains. The first two "cases" are gimme's. They show you whodunnit, but from that point on it's all "Figure it out Yourself", which is awesome for me.
The game is very straight forward and very linear. It's hard to mess up. It's 90% text based, so you'd be buying it for the mental challenge rather than the fancy animation...which there really isn't. It's mostly 2-d from cases 1-4 due to it being a port from a Japanese GBA game to a DS game, but they put some stuff in the fifth case that REALLY screams "YOU STOLE CSI'S GIMMICK!"
Like I said, this thing IS a port from a GBA game to a DS, so originally it only had four cases. With the DS version, there's 5 cases. It may not seem like a lot of cases, but these cases tend to last a fairly long time, usually three "In-game" days that can take up some time, couple hours for me. Phoenix Wright is a Defense attorney, FYI.
1st day you do initial investigating into the case which includes talking to witnesses and investigating Crime scenes, 2nd day you usually FIRST go to trial and cross-examine the witness, then spend the rest of the day doing FURTHER investigation because (surprise surprise!) the witness either LIED\the Prosecution left out or hid crucial evidence that gets revealed/something else happens. Third day Is the final court hearing, usually, where you make or break your case.