It's called constructive criticism. Everybody knew that it wasn't going to be a jetfighter plane of mobile apps simply because the 3DS is weak hardware, but that doesn't mean that "anything goes" and everyone will bow down to the might of Google - there are things that could've been improved and should've been improved.
I'm sure the app will be updated it just came out today, patience my friends. It's really not all that bad for what device it's on, it's definitely not great either but people need to stop jumping on the bandwagon.