I do not get why Hidden Agenda is being dragged so much on this site. Yes, Dunk's acting is subpar, but the rest of the cast are all great, and the story, while not unique by any means, balances non-cringy humor, drama, romantic tension, and surprising revelations really well. JoongDunk's chemistry is insanely good. Watching the two of them bicker as sparks fly between them is high-quality entertainment. The characters are likeable and easy to sympathize with, especially Zo. Yes, he is a chaotic fool, but he is trying! He just needs a little help to overcome his awkwardness and self-consciousness, and he will hopefully get this help [and more] from Joke, who, in case you are worried, is not an a**hole. Going by what I have seen of him as of now, I can even say that he is surprisingly mature, kind, and good at communication for a "cold, handsome, popular" BL lead.

Overall, I enjoyed the pilot episode of this series a lot. It is up to you, but if you are interested in watching it, do not let the criticism influence your decision much. Hidden Agenda is not nearly as bad as the other viewers are making it seem. I think that it even has potential to become really good.

Edit: The second episode is a little underwhelming. Except for the debate club scene, its plot is a whole lotta nothin' with clichés on top, especially in the first two parts. This series has the potential to improve, though. JoongDunk are really cute together and have great chemistry, Joke is charming, and some interesting things about the different characters' connections to each other are suggested.

Edit 2: Oh, the sweet, sweet tension between them... *heart eyes* I loved episode three. There is something about JokeZo's dynamic that makes them stand out from other BL couples that I have watched. The way in which their relationship progresses keeps surprising me, and Joke is coming increasingly closer to being my favorite love interest ever in a BL series. If you want something feel-good, funny, and romantic, watch this series.

Edit 3: The more I watch this series, the more I like it. JokeZo's interactions are so natural, so human. Although the plot is light-hearted, the progression of their relationship adds depth to it. JoongDunk's chemistry -- what can I even say? They are on fire in episode four.

Edit 4: Okay, I was defending this series, but now that I have watched episode five and six, I see where the other viewers are coming from. Every character in Hidden Agenda is supposed to have a hidden agenda, but the story does not do a good job at indicating this at all. It should have been building up toward the big reveal, not hiding everything behind a bland plot.
I also agree with everybody who says that something is off about this series. I am feeling the sinister vibes, and I am pretty sure that this is not what the production team was aiming for.

Edit 5: In episodes seven and eight, the plot went through an identity crisis, but JoongDunk's romantic scenes made them worth the watch. I lost count of how many times I have rewatched the bed scene -- it stands out from all other bed scenes that I have seen. Both Joong and Dunk were incredibly convincing, and the scene itself had a gentleness to it that I usually do not see in other BL series.