You really should continue!
Hydra is a common theme throughout the Marvel universe. It is NOT something thought up for this series.
If you stop watching, you won’t see how Coulson eventually takes down Hydra and that fits right in with the beginning of Avengers - Age of Ultron. It’s Coulson who tells Maria Hill where Baron Von Strucker’s castle is that the Avengers attack and then retrieve Loki’s scepter and release the Maximov twins (Scarlet Witch and her brother Quicksilver).
And the Framework, Life Model Decoys (LMDs), Inhumans, Ghost Rider—all are deep dives into Marvel subjects that fill out so much of the overall Marvel universe.
The problem is that they can just make a “friend” that you know into a Hydra operative at any time and suddenly everything they did in all the preceding episodes takes on a different perspective. It’s not how real people operate. When Ward turned out to be Hydra, it ruined the show for me. And not because he’s hydra. Rather, because of how easy the writers could just make any character suddenly someone else at the drop of a hat. I just can’t take that sort of writing seriously.
It also means that any character, at any time, could suddenly be hydra.
Nope. I’m not doing it. I stopped being able to suspend disbelief. But I highly recommend season one to anyone. Great characters, even if they turn out to be someone else in the end. At least I was able to suspend disbelief up to a point.