First of all, I want to apologize in advance for any mistake in my English... (I keep learning)
I've start to watch this tv show this month (yes, may 2011).
Why? because I was watching The Big Bang Theory and Two & a half men, and I was ok, the comedy field was complete.
But then came the Charlie Sheen debacle, and the future of TAHM was in jeopardy, so I decided to make a sort of casting and HIMYM won!
Luckily I discovered an excellent tv show, with great characters and solid scripts.
My favorite tv show ever was and will be Friends, and HIMYM reminds me to it in the way of how the characters are and how they get along with each other (but, of course, each sitcom with its own style).
The characters are perfectly portrayed by the actors. And by the way, I'm happy to see Neil Patrick Harris playing this AWESOME role of Barney Stinson, he's so perfect for it (The last time I saw him regularly was in "Doogie Howser, M.D.") and now is so grown up and suited up!
By the moment, I gave it 7/10 coz I'm just in the season 2 and and you can always improve. :)