I have watched this show since episode 1 and I got hooked eversince. I waited eagerly for each new episode, and the show maintained a good pace and an interesting plot till the ninth episode, which was a great cliffhanger. I really wanted the finale to be good, I truly did. However, it was not. I am not gonna spoil anything, but the whole show was destroyed due to this anticlimactic run-of-the-mill ending. I believe that the reason behind this ending is purely for profits sake. HBO saw that the ratings for this show were much higher than excpected and decided to make a second season instead of wrapping up the whole story in one single season like they originally planned. That's why I believe that the post-credits scene (which was a cheap Hollywood-inspired this-is-not-over-yet kinda of ending) was shot at a later date than the rest of the show.
Damn you HBO, you could have given the world another Chernobyl, but instead you gave us another GOT.