Splinter Cell Essentials is very good.

User Rating: 8.5 | Tom Clancy's Splinter Cell Essentials PSP
I'm very pleased with Splinter Cell Essentials. The controls take getting used to. Once you spend time on it (10-20 min.) the controls get easier to use. Sound is good, but could be better. The background sounds become choppy during game play sometimes. Graphics aren't excellent, but don't impede game play. Game play is harder than using a mouse and keyboard or game controller, but that's forgivable because the PSP doesn't have a second analog stick. Ubi soft did a very good job with the PSP's lack of a second analog stick. Overall I’m pleased with the game, and it is one of my favorite PSP games.