The Gunners won 3-0 on Saturday at Emirates stadium as Bukayo Saka, Kai Havertz and Viktor Gyokeres, his first for the club, struck the goals.
Arteta said afterwards: "Yeah, well especially with the results because we did a lot of things very well on Wednesday but we did a few things that cost us goals in a really naive way and today we have eradicated that much better and I'm very happy with what I see, I think individually as well some big performances against a Champions League opponent, good feeling.
"We have learned a lot of things in the last two games, we have to review this one as well with two very very good opposition, one when the game went against us in terms of the result it was very different from the beginning, it could have been very different on Wednesday as well about our efficiency in the final third, it wasn't at the level of two days but yeah a lot of information to gather collectively, individually as well and I think overall we had a very very good preparation."
On Gyokeres getting on the scoresheet, Arteta also said: "Yeah for sure I'm lucky that first goal is always very important, the way he took it as well, really well so again I think we have some big performances, we're developing certain connections as well, with the new players very good, Kai coming in as well, the goal he scored I think was top as well so everybody, raising the level of everybody is going to really help us because at that level we're going to need our very best from everybody."
Asked about what the Swede will bring to the team, Arteta added: "Well I think his goals, his threat, I think he pins both centre backs, he's a player that when you're living with a space, one against one, he's going to destroy you.
"So he's going to create a lot of space as well for us and yeah, the moment that in any situation there is a player there that can score a goal."