I'm of two minds.

It's GOOD in that they're almost the only interactive moments in the MSQ. I would rather be doing stealth missions than walk from point A to B.

It's BAD because they serve almost no narrative purpose, they're not particularly engaging (just stand still until the npc turns around, then run to the next hiding spot), and they take a while. Apparently some people have failed them as well, but I really don't think the difficulty is anything to complain about.