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It's a 20% mitigation on average against most skills, and very powerful. That's why alot of people use it. On top of that it also breaks roots/snares, which is why alot more people use it than blur and mirage.
That many players use it doesn't mean it.s bugged. That just means it's a good skill.
Many nightblades use surprise attack, is it bugged?
Many templars use purify, is it bugged?
Many players use vigor, is it bugged?
Many players use healing ward, is that also bugged?
I could go on but you probably get my point. Good skills get used, bad skills don't (or rarely)