User blog comment:Prismwolf/Best Upcoming MARVEL Film: Avengers vs. X-Men vs. Guardians of the Galaxy/@comment-1713281-20131001143346/@comment-23980147-20131002021238

The sentinels were never that scary in appearance, even in print. Just very basic, sometimes large to sometimes giant robots. Kinda like the cybermen from Doctor Who in their vanilla appearance.

What made them scary was there endless adaptability, like the Borg from Star Trek. Even then, the fear was always explicit in the reaction of mutants who knew they were always close to death anytime even one was around; and there almost never just one around. Well, except for Nimrod anyway.