I think the 2 new fullbacks have started well, as has Can.There is that.. but questions have to be asked in regards why thess new players are not performing..
Lazar is young and needs time, as does most foreign players. For example Henry - he was bad in his first season for Arsenal and then look what happened.
Mario - well we knew about him, no way was he going to be a sensation. But he has immense skill and potential. Partnered with the right player he'll be fine - look at the Spurs game. Shame Daniel is injury prone and when he's on his own up front and the service is poor, it affects the strike team.
Lovren - the only real disappointment. It's like, he doesn't even talk to the other 3 defenders especially his partnering CB.
Lallana - he got injured, but there's been glimpses of his ability and it'll come through. Again time is needed.
Lambert - isn't he playing as everyone expected?
Fundamentally, if you look at all those, losing Suarez, playing in the limelight of the CL and didn't adjust your expectations for a Spurs situation then you haven't been paying attention.