When I was a kid, I really liked Jedi, it was my favourite, SW was 2nd and ESB 3rd. And to be honest, when TPM came out when I was 11 it became my favourite at the time. (and yes, I still have a bit of nostalgia for it and enjoy watching it tons more than ROTS, not to mention AOTC but that's a different story, of the OT I liked ROTJ the best and at the time I really liked the SE for that matter). As I got older I didn't like it as much. I had no particular reason, I didn't analyse the film, it was just that in time I'd play the ROTJ VHS less and less and ESB more and more with SW keeping its steady 2nd place (and I totally let go of the PT). What made me realize the actual reasons why Jedi wasn't as good as the other two (I never really gave it much thought) was this article: 50 REASONS WHY RETURN OF THE JEDI SUCKS , similarly to how I realized the PT sucked and I didn't like it much anymore (I was 11, 13 and 16 when they came out and so they kinda grew with me and then I've outgrown them) but I couldn't have given you reasons why, until I saw redlettermedia's reviews.

But I still really enjoy watching Jedi very much (especially in its original version) and with all its flaws it is a fun film to watch.