Hearthpwn

First off, I play casually and don't tend to approach the ladder seriously, so that being said I'm currently sitting at Gold 3 and my experience might not match everyone's. I've been playing since Beta so I feel like I have a good feel for how people play. 

Over the last month or so, I've seen the hord of players with those 4-5 character lowercase names playing the same Death Knight deck over and over. They're practically free wins since they don't adapt strategy and play at the same medium pace every turn. What strange though, is that on top of that, I'm also encountering some other players with more normal names but the play style is insanely fast. The moment their turn starts, the card they just drew is already being played and they don't miss a single beat card after card before their turn ends. I understand some players know their decks well so can play fast, but this is over the top.

Combined, these 2 types of players easily make up what feels like 70% or more of all of my matches. Is anyone else experiencing this or am I missing a piece of the puzzle?