Are Poker Sites Really Competetive?

Given the present state of online poker, many people seem to be unhappy with, or critical of, all online poker sites for one reason or another. I'm not talking about "rigged" issues but rather a combination of all the components of a site that either makes it a great place to play, deposit, withdraw, selection of games, etc etc. or a bomb of a site. So, I'd like to start a discussion of how everone feels about online poker in its present state.
1. Are there really significant differences between the top online poker sites?
2. What kinds of things do you think would comprise a "perfect" site?
3. Would you like to see more sites, or fewer?
As an afterthought to this post, how would you like a site with NO RAKE, but rather, say, 4 different membership levels (bronze, silver, gold, platinum) with flat fees e.g. 25, 50, 100, 200 dollars (or whatever) a month? Each membership level would allow access to increasing levels of games, tournaments, and other benefits such as freerolls, qualifiers, etc etc?