anyone like to tell me what exactly is wrong with check/call? this is my totally standard defensive line and has worked well for me.

by checking you induce a bluff from high card hands that hope you have given up. you know the chances are that he has missed that river and will try to stab at it a decent proportion of the time.

betting your only getting called by better hands and most of the time folding worse ones. and you take this pot easily enough times to not fold the river.

check/call is the best option here.

edit: also the hands which do beat you can check through this river costing you less