I bring this up to establish that I was neither a fanboy of "The Walking Dead" or TellTale Games before I played the first season of the game. Therefore, I can say without any bias that the game is in fact a masterpiece. The expansion, "400 Days", is unfortunately not as enjoyable.
Now, about S2E1... I played and beat it last night, and I say it's definitely a good successor to season one and probably even redeems the series a little bit after "400 Days".
[SPOILER ALERT FROM SEASON ONE]
Not far into the first episode of the first season, you'd find an eight-year old girl named "Clementine". She would quickly become the character's focus. The creators did an excellent job of making you legitimately care for her, and put her well-being above everything else. You start off protecting her, but as time passes on you're motivated to instead teach her to be self-sufficient for when she'll inevitably have to depend on herself.
The first season ends off with Clementine having to venture on her own, hoping to find old friends but with a lot of uncertainty. It was quite the cliff-hanger, especially considering how invested the audience was with this one character's fate.
Season two has you taking control of Clementine herself. I wasn't sure what to think of this at first, playing as the character who I was previously protecting and mentoring, but it works out. With the season taking place 1.5-2 years after the first, you see that Clementine has indeed changed and matured, molded by the cruel world she lives in, but also the positive influence of your season one character. It was satisfying seeing that the character has grown stronger.
Only being one episode in, I'm not entirely sure that this will be as good as the first season, but so far I have high hopes and don't regret investing in the entire season from the start.