Yes, it's OK to win a battle and have them run off with their tail between their legs, but, don't trounce them into extinction and then write something to ret-con them back in. Once or twice was fine, but, it was getting redundant
I think the deeper issues is the writers actually hate writing Dalek stories which is why they get killed off BUT they are such a big audience getter that there is this huge pressure to bring them back. This was especially noticeable during RTD's reign when the pressure to create a spectacle always forced him to bring them back.
Moffat is right not to bring them back but I don't agree with his reasons. Is not that the Daleks were overused but misused. RTD made Daleks so insanely powerful and dangerous, their defeat made them comically stupid. In the classic series and Big Finish the stakes are smaller so continuous defeats don't detract from their awesomeness.