Of course, it is idiotic especially with slow defenders. If anyone saw Brendan Rodgers post match interview he says that during the week they explicitly worked on getting midfielders running past our defenders to exploit the high line. West Ham did the same thing, didn't even bother playing with strikers just had midfielders charging forward from deeper and our defense didn't know what to do about it.
The only time I can think of when it is wise to play a high line is against a team like Stoke that generally plays a long ball game with slower forwards. If a defender hits a long ball to Crouch, it is far less dangerous if they are pressed into their own half and Crouch is receiving the ball on the half way line, because it's not like he's going to flick it around the defender and break through one on one. But against forwards like Suarez and Aguero it is ****ing idiotic to give them that much space behind the defense.
And in attack it gives our players less room to operate. I thought that was obvious when we dropped the line deeper against United, Fulham, and Sunderland, we were a lot better in an attacking sense and then he goes and repeats the same mistake against Liverpool. Oh well, it cost him his job. Only has himself to blame for that.