Plot: This season primarily focuses on Meredith navigating her life after learning that Derek is married. We get a taste of Finn the handsome vet, but season two is so much more than Meredith's love life. We get to see how brave she is in the bomb arc and how fiercely she protects her friends with regards to Cristina's abortion and Izzie's LVAD decision. The character growth that we see for the other characters is also sublime, as Cristina softens and George grows confident.
Ending: Oh man, where do we start? Meredith and Derek hook up at the hospital prom and Denny dies not long after Izzie cuts the LVAD wire so that he can get a heart. Two words: Chasing Cars.
Weepiness: We bet you didn't cry harder any other season than you did for season two. It's just that good, and there are so many major moments, including Meredith's "pick me, choose me, love me" speech, bomb squad guy's death, and the train passengers' tragic uncoupling.