To address the issue of the best team "always" winning, I would refer you to a book called "The Drunkard's Walk". It's about randomness and its effect on life (or something like that - it's been a while).
IIRC, in a 7-game series, a team that is "10% better" (ie. 55:45) has about a 60% chance of winning the series - still not much better than a flip of a coin.
If you have two mismatched teams, such that one is twice as good as the other (66.7:33.3), the weaker team will still be expected to win about 20% of the 7-game series.
Don't quote me on the exact numbers, but I'm sure they are close; I'll find the book and repost the exact numbers later when I get time. This assumes that all "random variable" such as lucky bounces, refereeing effects, etc are truly "random"; the author made a good argument as to why you could assume this.
(BTW, this is my excuse for why Detroit lost - random variation - and I'm sticking to it...)
EDIT: here is a weblink that touches on it - jump to 13:50
http://www.lolsports.com/tag/odds-of-winning-a-7-game-series/
At least the first of the two numbers I quoted is correct...