I don't know when Bungie changed this and who's dumb idea it was, but before (all these years) "invisible" Hunters were at least a little bit visible. Now they seem to be 100% invisible.
This should not be a case in an online fps pvp.
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Invisibility is fine in most situations. The only times I personally struggle are... 1) On maps that have a lot of angles to peek... Hiding from radar gives Invisibility a big advantage for being unpredictable in such a scenario. 2) On maps that have a high glare, because invisible players are much harder to see when against a bright background The only thing that can be fixed is (2). (1) is just the inherently strong part of invis.