The guy has made saves that have been as good as a goal at the other end. We have points we otherwise wouldn't have had due to his performances.
Yes, distribution is at times lacking (this genuinely annoys me)...and yes, He is prone to a moment of madness (as all keepers are).
People have seemingly forgotten that Max ousted Bents from the sticks whilst he was still here. Maybe due to a character clash with NP, maybe not.
Given the choice between spending money on a striker or Keeper..I'd keep Max and spend on being more clinical at the other (business) end of the pitch.
In short, he continues to grow in strength and stature for me.