Let's be fair. This is a game meant for practice, not lessons.
I love NitroType. I keep seeing criticisms in other reviews that it doesn't "teach" typing. Understand that this is a product put out by Typing.com. The lessons are at Typing.com, and they are free. This is meant to supplement rather than replace lessons. Or get your lessons wherever you want and use NitroType for reinforcement and something fun. They even provide graphics to set up a leaderboard on your bulletin board, which is a fun idea. The only thing I struggle with is that my students like to race each other, and since they aren't all at the same level they start to focus on speed more than accuracy and go back to their old ways. It's not a problem when they just compete against computer-assigned players, because they are all at roughly the same level of ability. Love, love, love this program.
How I Use It
I use it as practice with my keyboarding students. Sometimes they will get a whole "NitroType Day" in class, which they love. Often they will play it on their own in their free time.