No, it really isn't. The first season was glorious. The second went completely off the rails. I still haven't watched the first episode of the third season, but hopefully it's found it's footing once more.
The best Marvel based tv series remains Daredevil. Pacing issues aside, it's the best acted, most consistently thematic and well made of all their television efforts. By leaps and bounds the best of the Netflix offerings, and I feel comfortable putting it ahead of Agents of SHIELD solely because of it's laser focus on it's characters. SHIELD is excellent tv, but it wanders off book for whole episodes and gets away from what it's good at. And it's villains have been subpar pretty much across the board.