I do think keepers can have it rough sometimes. A striker can miss 3 easy chances, score one and be a hero. A GK can make 3 world class saves, make one mistake and be a villain.
That said... Only a loon would argue Mignolet's good enough for a top 4 team. Klopp's no fool, he'll have a No. 1 target for the summer. Migs will make a good No.2