I've heard complaints about input lag on Ocarina of Time, graphics, and the control scheme in general. Input lag is noticeable, but I think it really is a problem for people who are accustomed to playing the games with a certain amount of lag. I've played Ocarina of Time many times across several formats and haven't had big issues with the lag. The graphics seem fine to me. Fog effects are almost nonexistent in Ocarina of Time on the Switch which is jarring for some people, but I wouldn't have even noticed if people didn't point it out. The control scheme is really odd (you have to use the right stick or a button combination for c right), but it hasn't been a problem for me except for control stick sensitivity. On joycons the stick is much more sensitive than on any other format I've played Ocarina of Time. I am very consistent at all the archery games for the OoT and MM across N64, Gamecube, and 3ds, but the very first slingshot gallery in OoT on the Switch took me 5 tries. I reached the adult portion of the game and still am having issues with aiming in first person.
I still will play these games over and over and love having them on the Switch. I hope there are some improvements made though particularly on control options for button mapping and control sensitivity.