He's a bottom half goalkeeper. We signed him from a relegation scrapping team and he's ranged from average to dreadful in his 3 seasons here. He's done absolutely nothing to ever suggest he should be anywhere near a club like ours.
Stick with Mignolet? Yeah boss. Lets just wait till he makes his inevitable fuck up that costs us a goal shall we. Something which could have happened at the weekend only for him to be saved by the crossbar.
There's a group of keepers in the league who are obviously better than Mignolet - De Gea, Llloris, Courtois, maybe Cech,
There's the next group of goalkeepers which are a step down. A much bigger group with different strengths and weaknesses. I think Mignolet sits in this group with the likes of Adrian, Forster, Begovic, Vorm, Schmiechel, Fabianski, Butland, Heaton. Some people may prefer one keeper over another but in general they are about the same overall quality.
For me Mignolet is not the best keeper in the league. He's not even close to that top group of keepers. But neither are about 25 other keepers int he league.
Who knows what group Karius is in (or could be in with time). For me he currently sits in a group with the likes of Bravo and Mandanda. Keepers who have been excellent in other European leagues. But keepers who have not been tested in the Premier League. A league in which as a GK, you face a unique set of challengers. A league where you can have the likes of Robert Huth taking you out at every set piece.
I suppose my overall point is that Mignolet is not necessarily a bottom half goalkeeper. If he is, then I think you can throw that judgement at most keepers in this league bar 4 or 5. It doesn't make Mignolet good enough for us long term but it might do in the short term whilst Karius is introduced to English football.