He's a really fun character and I have seen some great uses of him recently. One player used his ultimate to flank us going invisible behind cover (we didn t know he had used it) then running down the side of the building we were in. I spotted him for a second but couldn't see where he went.
Another guy 1v1 me at the end used it to escape me when he should have been dead and I lost him in the building. He ended up winning by getting position on me. .
So all in all great character.
I've also escaped a few times myself with him, even with his passive which is useful in the middle of a firefight when enemies are distracted. (But no use 1 in 1 as it shouldn't be).