IGN posted top 10 episodes, can't say I agree with all of them.
http://uk.ign.com/articles/2013/10/04/top-10-breaking-bad-episodes?page=2
Here are my top 10 and a short reason why i love this one slighty more than the rest (ranking BB episodes is like saying which child you love most):
1. Ozymandias - Never felt so tense watching a television show. ever.
2. 4 Days Out - This was really the episode where i knew i was watching something special. Plus 'A robot?!'
3. Half Measures - Mike's speech
4. One Minute - Jesse's speech/Hank and the cousins
5. Face Off - Gus walking to his death/Two-face
6. Dead Freight - Before ozymandias this was as tense as it got for me
7. Confessions - Jesse finally waking up to Walt's lies/Gasoline scene
8. Problem Dog - Jessie's Speech (Aaron Paul really shining)
9.Crawl Space - Walt's crying turning to laughing
10. Fly - Brave and powerful