Early impressions:

-He's gonna destroy in KOTH and 2 CP points that are surrounded by walls

-He'll be close to useless in payload maps with lots of high ground

-His mobility is pretty damn OP. Definitely the strongest asset of the hero. Can cover more ground than Winston in short bursts.

-I don't think his ult is all that great unless you catch people sleeping or combo it with Zarya or something else. If you're sharp with the audio and visual cues, you can pretty easily evade the big damage with the vast majority of heroes due to a full second landing delay. The damage in the outer fringes is pretty weak.

-It's interesting that his most powerful ability has the shortest cooldown

-Sombra counters him HARD. It's like hacking a Tracer only easier to do.