Is Avast Mobile Security effective?

[LemonScrub]

My wife uses an android tablet, and likes to download games and such from google play, she doesnt really check out the ratings or permissions when she installs the games, if the game looks interesting, she installs it. She has avast loaded, will this be enough in protecting against malware, spyware and such, as she also does email, internet and banking from the tablet too..