You have definitely seen the movie before, just without the spies.
A typical teenage coming-of-age flick with a new girl navigating the turbulent dangers of the high school social scene, except this time she's a spy. Barely Lethal felt like an old-school Disney channel movie with a slightly bigger budget and better stars. Whether that is good or bad is up to you. There were some funny moments, but it hit almost every cliché to the point I was guessing most of the dialogue before they even said it. While it didn't bring anything new, it was still a decent, enjoyable film. Some of the acting was good. Some was overtly cheesy. I always enjoy Samuel Jackson as a cranky mentor-type character. Ultimately, I didn't hate it and didn't love it.