Depends on your roster he was my MVP for 6.3/4 incl GM but that was pre nerf. Used him a fair bit in exploration too. It’s much easier now and there’s more counters for bosses like magneto etc.
I use him in Variant content, Cav EQ, He was an Act 6 MVP, had a few uses in Act 7.1. He had great damage after 20-30 combo, can shrug off things fairly reliably even before the 100 combo, can get the true strike buff (or whatever it is called) after 150 combo. You can, in endgame content, get around 30-50+ hits at least per fight, if not 80-100 your first fight, so it is not really too hard to access his utility. He is also a god in Sector 7 & 8 incursions, as you would assume.
Any content where you can get him ramped above 100 without too much hassle he’s very viable for. At that point he’s got solid damage and 100% tenacity on crit so his utility is covering most of what you need. He’s a great champ, you should be very happy with the pull.
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Edit: You literally need only 2 easy fights or something to comfortably ramp him up to 100+ combo (depending on sig, I could do that at sig 80).
May he serve you well