I thought Toy Story 4 was actually really good. Just a fun, light hearted movie, with good re-watchability. And a lot better than Toy Story 2 (don't get me started).
I'm not sure how I feel about Toy Story 5. I was happy with the ending of #4 (thought it had some good closure). I would be happy either for the story to continue or for them to work the gap (or both, via flashbacks, etc.).