Oh man. From now on I am going to respond to angry players by saying "If you going to rage, at least play trynd so it is cannon." That cracked me up.
As for ranged DPS vs tanky melee DPS... It can be tough. I have been playing a lot of Ashe ranked. She is one of the ranged DPS that really lack a quick retreat move. This means if you are caught out of postion it can be really hard to survive. Also, a fed tanky DPS basically takes you out of the game.
That being said, I still think Ashe has a spot on any team. In general tanky DPS can stun lock and kill you, so as long as you aren't 100 miles from your team you have a chance. Ulti + exhaust = about 4 or 5 seconds you have to get away. Then, if they chase, you can always do volley behind you.
But really, you shouldn't be getting caught away from your team/tower at all. It is best to go in after people have dropped their skills, while the melee are on the mages, and start doing damage and kiting. If their fed carry spends all his effort following you around only to kill you and die, that is a pretty good trade.
Finally, any tank or support that can give a ranged AD carry some breathing room is so valuable. A 2 second stun or fear can take a lot of life off of even a tank and if the ashe is smart and hits the enemy with arrow right as the stun wears off, it is pretty much a done deal.
All that being said I need to find a tanky dps that A) doesn't get banned B) is decent but not so good he will get nerfed and C) some other third thing.