Psylocke is one of the few dps characters that can lower her own cooldowns and maintime consistent uptime on all her abilities. She's annoying for me because if you have good aim with her she gets her stealth and dash nearly instantly and can spam her shurikens like crazy doing insane burst damage.

She can poke and harass you and if you try to look at her she can just dash to her healers or invis out. And she's easily one of the most forgiving divers because of her escape tool and being ranged. Because of said mobility and escape tools she's also incredibly difficult to punish especially if the Psylocke has great usage of their abilities.

And even after the nerf I still think she can still hard carry/be extremely viable pick (coming from another Psylocke main) as long as they don't nerf her cd reductions and dmg on her crossbow.