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Is Phoenix actually this good

I'm going to be honest when I saw Phoenix I was hyped for the buff but after taking her to r2.....she's unbelievably mid

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Just do the rotation of 6 furies for medium fights
Nothing crazy but it's decent, she definitely won't be a nuke but she shouldn't have any issues doing 45-55 secs in BGs
Arena fodder for life
Attacker, too slow
In contrast to those examples you listed, she has easy DoT access, she has easy knockdown access, she has power lock immunity. Like Scream, Phoenix has a decent regen ability but she also can survive a KO.
None of these abilities I have listed have any use in Arena, so you're missing out if you're just using her for arena.