I have once or twice gotten all the 100 skulltullas in
OoT and never doing it again, but in MM I have never gotten the ocktorock shooting-gallery heartpiece because I suck at aiming. Otherwise I have gotten everything else in MM and always will. Just not that heartpiece and guess what. I'm satisfied even that I know my skills are not good enough for the final heartpiece. My top score in the ocktorock shooting is 48 and you need 50 to get the piece. Otherwise I do get all the bottles, sidequests and hearts in
OoT and MM. Just not worth doing the skulltullas past 50 or trying to get perfect in the ocktorock shooting. I'm happy the way it is.
And I have gotten the Hylian Loach about 3-4 times in
OoT and one of those was in MQ. That takes too much time so not trying again. I know I have done it so that's enough for me.