I agree with PA being pretty broken right now, she just does to much damage straight out of the start of the game all the way till the finish. She wins like every mid lane match up unless the other midder knows how to outplay the PA.
Tinker seems to be so damn OP when the person playing knows what hes doing...
for real my friend went 46 kills 3 deaths and 15 assists on a game
Normally, I do build a Shadowblade first on slark after getting boots of speed. And then, maybe echo blade because yeah, 2 hits in a row is good, you stole the enemy's agility which gave you more damages. I usually do the attack twice (echo) and then jump if the enemy tries to run and of course the first skill, since it's pretty hurt sometimes.
This hero is OP as fuck. Shadow blade is the best item for him to engage and disengage fights. You can even recover life while you're using shadow blade close to someone, out of the fog. The best thing on dark pact skill is that it purges most debuffs, like stuns, slows, even pudges ult. If there are many disables on the enemy team, is better to wait the best moment to use dark pact instead of just click it for the damage (or you can just go for a bkb). I like to rush shadow blade, then echo sabre and silver edge after echo sabre, the rest depends on the game.
I would farm real nice till I can get Orb of Venom and Shadow Blade, that's when I start ganking, then I'll upgrade Shadow Blade because Silver Edge is way better not to mention the bonus +10 on all abilities.
Anyway, Storm Spirit with Aghanim is kind of super useful in gank fight, specially when he got his best friend aka Enigma around.
Dark Seer + Enigma