Mignolet is what he is. He performed adequately a few seasons, but hasn't kicked on, but the signs are promising that the German guy with the cool hair will do so.You used to defend Mignolet to the hilt, now you accept he's shite. Only a matter of time before you realise and accept the same applies to the one with stupid hair.
Comparing lukaku with sturridge is like bringing a crab to a crawfish boil. The first one is a target man who lacks technical skills, while sturridge is a flying winger with quite some pass patterns.