It's honestly not that bad. The game only loads when you switch to a different part of town (and since there's fast-travel, this typically only happens once before any given story scene + battle plays out), and it lasts maybe 5-10 seconds on Vita and PS3 (3-4 on PS4).
If this happened more often, it might be a problem, but it's so infrequent that it's pretty much negligible. My guess is the reviewer couldn't read Japanese, and thus either didn't realize you could fast-travel, or was just aimlessly running around Akihabara from city block to city block without ever stopping along the way to actually do anything.
A lot of the reviewer's complaints, in fact, seem like they'd be resolved simply by being able to read the text, since so much of this game is carried by its likable characters, tongue-in-cheek story and general sense of humor.
-Tom