My oppinions:
1) Dreamflight to Buzz Lightyear- The most improvement from a rehab IMO. Dreamflight was a nice but terribly forgetable attraction that seemed rediculously out of place in Tomorrowland (what does an airline commercial have to do with either the future, sci-fi, or progress?). Buzz is truly a guest favorite now and something new that has never before been seen in a Disney park- an interactive dark ride.
2) Horizons to Mission: SPACE- What do you do when a ride that is rediculously outdated and not pertinant to contemporary audiences? Tear it down and create the greatest EPCOT attraction to date! True Horizons was elaborate and peppy, but it just seemed like overkill. I mean, it just felt like they took CoP, SSE, The Land, and Living Seas, but them all together and made one big deja-vu session. Mission: SPACE is fresh, different, and a lot of fun (and this is comming from somebody who usually does not like thrill rides!)
3) Toad to Pooh- I'll admit I was not a fan of Mr. Toad's Wild Ride (even though I love the Disney animated version of Wind and the Willows). It just did not meet my expectations on what a Mr. Toad ride should feel like. Pooh is a much closer to the feel of the original films and stories and does it all in a fun and innovative way.
4) Lion King to Philharmagic- I thought both of these attractions were excelent, but I think Philharmagic is just a little better. There are week sections in the presentation such poor animation in a couple of areas, but for the most part it's good. An improvement, but I wouldn't say much of one- just enough IMO
5) WOM to Test Track- WOM was a cute ride, but test Track is a lot of fun as well. It's about a draw for me.
6) Old Figment to New Figment- I think both of the current Figment and original were both good rides. The original was more elaborate, but I think the story is more cohesive in this version and the Institute theming is very good. The inbetween version was very sub-par quality wise IMO. The new one is an improvement over the last one, but in a whole I don't think it is quite an improvement in the original in many ways.