It's my favorite animated series of all time. Beware The Gray Ghost is possibly one of the best episodes of western animation of all time. Or at least deserving of a top 5 spot.
Not every episode is a winner, but by and large the first three seasons are top tier. I wasn't a fan of the change in art style to help integrate it into the DCAU, but even then, there are still great episodes for that season too. The Blu Ray boxed set is fantastic. I'm so glad I had it preordered way back when, and it was so worth it. My friend had never seen it, so I've been watching a few episodes with her over the past week, and she's loving it.
It's a timeless cartoon for sure.
The visual aesthetic and the storytelling ensures that it will continue to be enjoyed by viewers of all ages for a long, long time. Glad you're enjoying it too!