Mortred: The Phantom Assasin

Her crits, it simply happens or it doesn't

Yah, PA is good but there are just better heroes.
She's my favorite hero though and imo, she should be paired with a hero with harass or nukes that would kill fast, not disablers that need someone else to do the job, because early game, pa seem to be more of a semi-support than a hard carry.

Like when ganking, PA slows down an enemy, your ally will nuke him and pa finishes him off with phantom strike. I don't really level my blur since it doesn't do much against gankers using skills, except maybe for the radar. i prioritize that 100 pure damage with 4 second 50% slow and 5 second cd phantom strike with 100% attack speed increase more.

that's why for example, in a game where we had ursa and blood, i played as support for both of them, slowing enemies when we gank. mainly for ursa. i let him kill the enemy, only blinks if the enemy would seem to be able to escape.

Carries with sub abilities are the best IE semi role in game - this is why as well.
Naga Siren can initiate, as can Faceless Void but not as well.
Dragon Knight can tank
Anti-Mage has high mobility/escape, and the fastest attack speed - as well as an orb that stacks with illusions.
Lycan syllabear are both strong pushers

I see this hero alot, the main mistake i see is that people think that they can just get a battle fury and they will win, what they do is just farm all game and lose.

It is also important that you realize PA is chance based when it comes to dealing out good damage. You don't get a crit or two in a teamfight and all you have are autoattacks and stifling dagger. Sure she can hit hard even without crits but any hero could do that.

PA isn't actually that good late game. She's like DK or Luna -- a semihard carry that can participate early, but not one you want at 60 minutes.

Because there are simply better carries out there. Void, for example, will eat her alive with mkb. He becomes a nuisance in teamfights a lot earlier than PA as well.

nothing.. any better would be OP
The reason she is not used, is early game she is pants. She can't do anything. After 30 minutes, she can take down a whole team yes, but before that she essentially farming.
to give you an idea how long 30 minutes is, the average game the international lasted just over 20.. so pro teams don't have time to spen 20 minutes + farming a carry, when racks are being pushed already.

What they need to do is make towers tankier, so even after a clash, it is still quite the mission to push a tower - that way the games last a little bit longer. Thus making late game carries more viable..