Yeah, that clearly needs to improve.
Unfortunately, where we're weakest in defence is probably the most difficult position to defend. i.e. In the centre/second row channel.
I don't think we can underestimate how much we're missing Galea, he completely galvanises our right side. In a typically Roversesque quirk of fate, we seem to have evened this up by also forgetting how to defend down the left!
Something else I've noticed is that we've developed a stupid habit of going for big shoulder charges. This is fine if you follow up with an effective tackle, however, we're allowing people to bounce off and then either off load or make more metres. Particular offenders are Whithers and Mika.
Edit: I was talking about defence in reply to cravenpark1.