Finally finished Part 2 of Season 5 last weekend (yeesh, try dodging spoilers for so long!). As much as I like happy endings to shows, I didn't see a way they could conceivably do it with Breaking Bad and I liked how most things were wrapped up.
Bryan Cranston really shows his acting chops with the show - it's a travesty that he and Aaron Paul didn't win their Emmys this time around. Interestingly, when we first started watching the show, we had a bit of a tough time getting over mentally taking Cranston out of his role of Hal from Malcom in the Middle (although you do sometimes see some bits of Hal in the funny fucked up situations Walt gets himself into).
There's also a rumor going around that Cranston could be the next Lex Luthor, which I could see him doing and would be great as a scary intimidating Lex as opposed to the comic goofy ones we've been getting.