I think that 1 and 2 are great games but haven't aged well. It's very much one long story so jumping into the middle or into 3 wouldn't work so well.
What's the order of these games 1 and 1.5 etc or is 1.5 etc the remakes?
I tried the first game and found it to be repetitive and boring. But each to their own.
I'm a big Final Fantasy and I really wanted to give these a go, so I grabbed it. I gave a few of the games a really good try (20+ hours) but in the end, despite wanting to, I just didn't enjoy these. The combat was great, especially in the second one, but the dull, completely irrelevant Disney worlds, the hours and hours between the main story beats... In the end with a heavy heart I just gave up. Looks amazing, music incredible, but otherwise emperor's new clothes for me.
Hard to answer that question. This bundle includes most parts from all the remaining titles released for consoles in the past. In terms of graphics some of the show their age too although they've been "remastered". If you are a fan you'd enjoy them all. I personally have played them all throughout years and loved them. But if you had difficulty with KH3, I'd be a bit hesitant to comment about what you should be doing. KH in general requires you to travel from one Disney related world to another. The older titles are mostly focused on classic Disney characters while the new one was about the modern titles. I actually loved that Pirates of the Caribbean level and I felt it was a refresh with very good music. :D