I thought, and still think, Breaking Bad is the greatest show of all time. It's series finale is incredible. I didn't think there were any questions unanswered, and it was up to the viewer to decide what happened to Jesse after.
It was great to see these characters again, and it didn't taint the memory of the finale whatsoever. It was a great, Western-like extension of the show. Some felt like the cameos were forced - but I didn't think so. Each felt pretty calculated and necessary. It added to the show and didn't take away from it (*cough* Arrested Development *cough*).
Again - 100% didn't need it, but I found myself riveted regardless. You forget just how sadistic Todd was, and it was kind of crazy to relive that torture chamber that Jesse was in. It was such an entertaining time, and expertly directed, that I couldn't help but smile throughout.