Emery has nothing to do with it, he hasn't managed a game yet, I wish him well, from what I've read he seems a good fit, I'm glad of the change...so far, and very much looking forward to the new season. The slide from top 4 to 6th is bad when you consider they were top 4 for 20+years and it was allowed to happen when it was obviously happening season after season. The defense Wenger inherited he never replaced and the midfield of Vieira and Petit were never replaced. I understood at the time there were financial issues due to the new stadium build and that was fair enough, but they passed that issue a good few seasons ago. More should have been done, either by Wenger or the board to have stayed in top 4. It's not a disaster, but it's harder to get back in than stay in as it may be difficult to attract better players.
If you're content with any Prem league position, that's up to you, personally I want Arsenal to win every single game they play...that's obviously unreasonable but I can't help it, I'm a fan and they're the team I support so I want to see them win first, and if they're playing entertaining football whilst winning, that's a bonus.