I feel like this show got off to a slow start, and even was honestly mediocre early on; however, the show gets better as the story progresses into a solid Shonen anime. For starters the major issue I had early on was the humor was ridiculous, and like some other shonen animes it took a while to get going. Which is understandable since these kind of shows are designed to have dozens and dozens of episodes over a planned 12-24 episode series.
I digress, but Asta doesn't join the Black Bulls until episode 6, and he doesn't on his first mission until about episode 8 or 9. We literally take 4-5 hours just to get on our first adventure beyond the training/intro phrase, and it wasn't paced well. That said, the first mission is okay, but nothing memorable. What really turns the series around is the Dunegon arc which isn't too long, but reintroduces Asta with his old friend and rival, Yuno. And we see multiple people form two different groups working together to overcome their challenges, and it works well. From here the show really gains momentum and becomes a solid show. Especially the Seabed Temple Arc which closes out season 1.
For me, and possibly others, the show takes about 13-14 episodes to turn the page into something enjoyable. The major strength of this show as it moves forward is establishing multiple characters with interesting and unique backgrounds, and they all have to come together to overcome their challenges. I also like Asta, but the show was weak only relying on him without a strong support cast in most episodes. The pacing improves, and even longer arcs are enjoyable and at a good pace.
Finally, the animation and sound design is good. I won't say it's groundbreaking, or the most beautiful thing I've seen, but it's smooth with some good action scenes. Some action scenes stand out better than others, but it's typical when it comes to a shonen anime. I say give this a chance, but you have to be patient to see if you like it after a good 14 episodes.