This is honestly one of the best animated shows I've seen in a long time. The voice cast is arguably on par with the movie, and I have to say that the authentic kid voices that George and Harold have here are even more appealing than their voices in the movie, while still being funny. The show remains true to the books and does its own things at the same time, and it's surprisingly smart and witty, with lots of crazy fourth wall breakage and crazy action. Sometimes it even uses its gags to create funny story arcs! George and Harold's friendship is the icing on the cake on an already funny and feel-good show.
All in all, it even beats a lot of animated superhero comedy shows I've seen on regular TV (Looking at YOU, TTG!). Netflix alone is worth it for this.