First 3 episodes were ABSOLUTE KINO, it had everything that I expected to see plus more. The action scenes were just amazing, the animation is too good, etc.
Episode 4 and 5 are going in a way that I don't really like. First, because they didn't have any good action scene, I thought the scene with the monster children was terrible, and even more the scene where Jack fights monsters with Ashi on his back. However, I really liked the fact that these 2 episodes were very "vintage" to Samurai Jack, they had themes that were similar to old episodes, like being inside a giant creature. Also, the "Aku city" enviroment, side characters and such were very, very faithful to what the old Samurai Jack was.
THat new season has many good things and some flaws, I think the good things make up for it. Greatest problem is the fact that Ashi is getting more and more importance, to the point where Jack probably will barely appear in the next episode. Also, I didn't like the fact that they introduced the Daughters of Aku as some final boss enemies, just to have Jack go all BLACKED on them in episode 3. The change of Ashi from bad to good was also very quick, but I understand it had to be like that for the show to have 10 episodes.
My favourite part of the season is the fact that it is very faithful to the past seasons. The trailers made it look like it would be a completely EDGY version of SJ, but it is basically the same show, just a little darker and now it has blood. Aku is still the same comic relief/evil lord; Jack is still a very powerful, unmatched character; goofy situations still happen, even when the scene is a little serious(like the Aku woman nightmare, Ashi screaming at Jack while tied in chains, and Jack saying "I like the back fur".)
Sincerely the best cartoon I have watched in a long time.
Btw, why did they change Jack's skin color? It has been bothering me.