"A squads first encounter with a titan, they don’t know the secret to killing one."
I'm pretty sure everyone gets lessons about a titan's weakness when they are in training (even more than the deadly weakness, minor ones like cutting the back of the feet to make the titan stop walking for a while) but that aside, resuming to the normal review.
The art style almost made me quit at first, but seeing the actual dynamics of battle and reactions characters had was interesting and made watching it worthwhile. You certainly would get 4 or 5 stars if you improved the art a little and also cared about details a little bit more.