Well, you could look at it and say Mané did his job. He was let down by the others. He can only do so much.
But yeah, I agree. He's not been here long, and it's not like he's single-handedly dragging us to finals like Gerrard did.
He's a member of the team. I can't stand these players being great team members until they don't get what they want, then they suddenly declare they're sort of semi-detached. If Sane had been in better form during that period when he was shite we might have finished second and reached another cup final. Everyone else's fault, I guess, for not matching his ambitions? They're either responsible collectively, or they're all jerks.