Is our team weaker than last season ? My opinion is we are actually stronger. Here are the reasons :

1) We got rid of some of the negative players (slow, arrogant, incapable or want to be somewhere else), thus having a better atmosphere.
2) More balance team (good defenders, good midfielders, good forwards). No superstar in the team, everyone is equal and fighting for each other.
3) Each position has two capable players. I like what I see with Jenkinson and Frimpong. As second choice RB, Jenkinson is no worse than Eboue and will only get better with more games played. The emergence of Frimpong finally provide us a backup of Song.

Some may argue that we have not replaced Cesc adequately. But Cesc contributions was not that great last season due to injury. Wilshere is our engine in midfield last season.