6-8 was a lot in the earlier editions!
Health and Armor increases, as well as Bloodlust, makes the Giant Killer and Deathblow card a real swinger - it landed :)
Probably not a lot of people have level 10 monsters.
Yes you are probably right. I've been playing in the higher leagues since I started and so I'm mostly up against maxed cards. I'm going down the tables slowly too and so I guess there's more people with good decks, and better at playing then me :)