PA is a subpar carry right now. I absolutely love playing her, she has brutal chasing abilities and her early game presence is gigantic, but when compared with other carries like void, sniper, magina or alchemist, she isn't that powerful late game. Hell, even a bloodraged bloodseeker can outcarry her (Carry bloodseeker is legit, by the way, you just need to get agi items, since bloodrage only affects that damage, not a fucking radiance). The reason is that blur is crap. MKB just turns completely useless an ability. Void's evasion doesn't, and panda has the crit to compensate, but after they get an MKB, one of her abilities has been completely neutraliced. And even without the MKB, it's not that good of a chance, unlike panda's ridiculous WHY DO YOU MISS SO MUCH. To boot, it also makes THE item for agi carries a bad pick on her, since butterfly evasion gets wasted.
The only thing she bests everyone in is using steroids. Empower, battle trance, vengeance aura or the wolf aura on her are ridiculous.
And just to start the discussion: The reason why bloodseeker is never picked by pros isn't that he's a bad hero, but that all three of his abilities require the enemy to make a mistake to be useful. You know what pros usually don't do? Yeah, mistakes. Thirst is an AWESOME movement buff and prevents jukes, but that's IF you manage to get an enemy under half health. Blood bath can get you up and running again in the middle of a teamfight IF someone dies. Rupture is a guaranted kill IF they don't have a TP scroll, and is great to hold them off position IF they get out of position.
So, what I mean is that bloodseeker is legit in pubs. And if your team is called Na'Vi, because they can pull off any kind of crazy shit.
By the way, Lina -> blink dagger -> infest -> laguna blade -> Naix bomb is just cruel. And really, really fun. Specially against a sniper and a troll.