Personally i think Liam Mottram is very overrated. Coming from a soccer background he tends to play his footy in a very soft manner. This is just my opinion having seen him play 2 or 3 times this year. I think he leaves a lot to be desired and needs to work on his tackling and hardness desperately so it doesnt let him or the team down come finals time.
The kid is 17 and has only been playing for 2-3 season's now, i think you need to cut him some slack. He will learn his trade and turn out to be a pretty handy player IMO.