Yeah, having beaten 3 of them this is entirely false.
They aren't that big, and built around the design philosophies of the Divine Beasts (relatively open spaces where you have to activate 5 terminals in any order) but are worse than them because they don't share that clever central mechanic of being able to manipulate the entire dungeon using the Sheikah Slate / Purah Pad. If you're looking for a linear dungeon filled with puzzles, small keys, boss keys, and a dungeon item - too bad. If you want big open spaces where you can climb / glide past most puzzles - then these dungeons are for you.
As to OCL - the Wind Temple is the worst one lol, it really is pathetic.