You mean like exactly what happens when a team sits deep and you can't get in behind them?
I agree, it's what the problem was, we weren't able to get in behind them so there was no opportunity to play any through balls. Sunderland parked the bus, came for a point, managed it.
And probably should have won. Liverpool did the same although they actually took the lead and won the game.
Whilst in possession we seem to get to a point not far after the halfway line and pass it sideways, nobody makes runs forward from midfield and the attackers don't get themselves into enough space.
The only way we seem to be able to attack properly is when there is space for the forwards to run into and at home that is a rarity unless a team comes to go all out against you. Since teams know this, they'll often come to Villa Park and spend most of the game frustrating us, breaking out to attack now and then to try and win.