Most OP hero

Drow rangers another symptom of nobody carrying any kind of vision...honestly I love seeing a drow, in pubs people get mask of madness on her, ok stun, dead

Ya she seems squishy. It's just so often in pubs her attack speed + slow makes it so your average melee carry can't get to her. If you have a team that can communicate well, you just have somebody stun her and it's not really an issue. but man if your team is all worried about securing random kills and she starts to focus you while everyone else on your team is wailing on Zeus... You're gonna have a bad time.

I'd say for ease to play and heroes that bad players can do will in Pubs with, I'd have to go with Sniper, Drow, Spirit Breaker and Riki. All take relatively low skill to be able to play, and if necessary measures aren't taken (detection, team-work etc), then they can really cost you the game.

Too many games I play in where people just don't want to work together. People will run off on their own to farm a lane, get charged and killed by Spirit. People will fail to buy detection for the Riki and the eventual Snipers and Drow's with Shadow Blades. Which will result in them snow-balling. I generally play support, and will always ward my lanes, but often my team-mates will not. So if I'm not laning against the Riki, he'll have free roam.

Team-fights can be quite bad too, with people all attacking different people etc. Allowing the Drow's and Snipers to sit at the back and score multi-kills lol.

As mentioned, ALL of these heroes are easily counterable, but that often means having a team that are somewhat coherent and coordinated. The problem arises that the vast amount of Pub teams you get paired with, will not be lol.

So for anyone that comes up against these guys, stick with your team and work together and you should have a much easier time.