I think its unfair to say hes average at best, everyone has there own opinion though.
I think once Kirkland settles down and realises hes not delf he will have a more willing attitude towards the more spectacular saves and become more consistant. But as of now hes doing a good solid job and instilled confidence (in him) in the defencive line, hes doing what we need at the minute and thats what matters. As much as i like watching spectacular 'keepers at work, if Kirkland plays boring i dont care, as long as he does a good job.
The reason he looks clumsy sometimes is probably because its like making a Liverpool debut again for him, its his first run of games remember and it does take a few to settle the nerves. Look at Dudeks first few games for us, he conceeded a few (3 in on his debut against Aston Villa) then went on to be the Premierships best 'keeper that year!
From what ive seen so far its very promising and i believe it will only get better for him, we have a future England No1 on our hands imo.