marcoasalazarm
Explorer
The "good-guy" factions definitely don't use them, and even Villains probably dig the mecha versions (the O*N*E Project) more than the automated. Because Sentinels all have the "mutant murder machines" stigma and the programming often glitches into "kill all humans because it's the only way to be absolutely sure that no mutants will ever be born" mode.
Of course, probably guys like Blue Cosmos don't care.
Of course, probably guys like Blue Cosmos don't care.