Hmmm - this 'Wenger is leaving the club in a terrible state' is not a narrative I particularly remember. I think the feeling was more that we had good enough players and enough money that we should be challenging for the league more often and winning the odd pot, not declining each year as was the case for the past few years. Throw in the lack of progress by many of the younger players and it felt like it he was not making the most of what was available to him.
Of course it's only been 16 games or so but not only has Emery implemented a new way of playing, we're within 6 points of the top of the table almost a third of the way into a season where the top 3 teams are on unprecedented runs. ManU won the league with 79 points in 99 and we might have 3 teams with more than 80 as it stands. Plus, we're seeing improvements in younger players (Holding, Iwobi, Bellerin etc) and tactical adjustments/substitutions that seemed to never happen under Wenger. All in all it's just a great start that everyone should be excited about.
If anyone feels the need to endlessly compare this to Wenger, rather than celebrate what he brought us while looking forward to what we can achieve under Unai, they probably are on a wind up (Burney) or in need of a life (Monty).