Our biggest problem is very simple - and it has been our biggest problem for years. A complete lack of technical skill and pace from our attacking players.
Please - forget all this talk about systems, formations or whatever. Every system has its inherent strengths and weaknesses, and those strengths and weaknesses will be highlighted at certain times based around one thing - the quality and suitability of the players that occupy the XI.
It's perfectly fine to have "utility" players in the squad, that can help "do a job" alongside the star attackers. If Mason or Dembele were playing alongside Fabregas and Matic in midfield, they would look significantly better than they do now. Our team however, is full of these types of players, with far too many not even being at that level.
Imagine if Lamela had been playing for Leicester on the weekend instead of Mahrez. Vardy wins the flick on, Lamela is one-on-one with Vertonghen in the box...the likely result is he would have been tackled and we'd have won the game. Why on earth do people suddenly think he'll develop the technical skill to run at players like Mahrez can? He has never ever shown that, nor has Chadli. So why are we not prioritising getting in players who can do that sort of thing too? When Eriksen isn't playing, like he wasn't on the weekend, where is the service to Kane going to come from?
If you have a real top class attacking unit - it doesn't matter if you have one defensive midfielder (Dier) who isn't that good at passing because he can rely on keeping it simple and giving it to the more technically skilled attacking players (see Scott Parker in his first season here). It doesn't matter if the opposition surround your star centre-forward because your fast, skillful dribblers will tear them apart with all the empty space they've left. It doesn't matter if your defenders don't mark attackers as tightly because the opposition will naturally sit deeper and have less men forward. It also becomes less of an issue if your defence is completely prone to brain farts and getting caught out of position - as not only will you have to worry about these happening less often with the game being played more in the opponents half, but a lot of players naturally panic and choke in the bigger games against better opposition, which we can put into them with the fear factor.
A lot of what Poch has done is very good - we press better than we did under Sherwood, we move the ball around better than we did under him or AVB. We have a young squad of generally quite hard working players. He is generally good at handling the media. But until we sign attacking players of real techical quality - then none of this stuff matters.
I guarantee if we'd replaced Chadli and Lamela in the starting XI with Mahrez and Ayew over the summer we'd have taken at least five more points from our opening games, if not seven more.