That it is. The show is significantly better than I expected as well. Episode 5 is when it started exceeding my expectations, and episode 10 (the halfway point of the season) is where it starts to really get good. Episode 13, "When Lightning Strikes" is probably my favorite episode, followed closely by the two-part season finale.
The show did a fantastic job expanding on Fishlegs' character. His relationship with his gronckle, Meatlug, is absolutely adorable. They did a pretty decent job with Snotlout's characterization as well, though I'd have liked more. He was my favorite of Hiccup's Dragon Training peers in the movie. I even quoted him in my senior yearbook.
Astrid stayed mostly static, though. She didn't grow much from where she was at the end of the movie, though DreamWorks confirmed they'd explore her and her family more in Defenders of Berk.
Ruffnut and Tuffnut weren't explored anywhere near as much as I would have liked. They had the typical twin angst episode--because apparently every show with characters who are twins must show them angsting about it at least once--but they're still held at a distance, which is a disappointment. I'd really like to see them grow in future episodes, both as a team and individually. Especially Ruffnut. I like her better than Tuffnut, but he gets more lines than she does.
And as I've said a few times now, the humor isn't quite as clever or funny as in the movie--with a few exceptions--but the drama is pretty on par, I think.