I've read the first book of Percy Jackson series in English. It didn't grab me at first. But I promised myself to finish it. And surprisingly it got better to the end. I think it's mostly because of greek mythology. I doubt that I will read other books in the series, but I got used to read couple of chapters in the evening. Feels like I got into reading fiction again.
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I also recently read The Lightning Thief for the first time! I had the opposite experience, actually. I preferred the first half over the second half of the book! However, I'm excited to keep reading the series and I think I'll really enjoy it.
I hope next books in the series are good as well.
I read the book last year and felt the same. I didn't like it at the start but it grew on me. I haven't read any of the sequels, but apparently they are very good.