Tower of Terror is at the top of the E-Ticket list in Florida. While it would be great if every attraction met that same standard it does a disservice to other quality attractions that aren't at the level of Tower of Terror.
Arguing about Soarin' being an E-ticket is comparable to arguing about Toy Story Mania. Demand would dictate that they're E-ticket attractions, and if the ticket books existed today they would be listed as E-tickets. However I think most people will say that the scope of Toy Story Mania is on par with other family friendly E-tickets. As for Soarin', it was an E-ticket when it opened but it's in rough shape. I think that's a real thing that needs to be considered. I think Star Tours could have been looked at it similarly as well. It's ticket level probably fluctuated as it became more dated/broken down.
Updating Soarin's projectors would significantly improve the attraction and eliminate much of this debate.
If you are talking about demand...Dumbo is an E-ticket.
If we are talking strictly about the "ride" and not the total attraction (queues, pre-shows, post shows, etc.) then ok...Soarin' would grade higher in my book.
More than just the ride, an E-ticket (for me) needs to make me feel that I'm in a different place.
When I'm on Soarin', I get the "WOW...this is cool!" feeling, but I don't feel as if I'm anywhere but a giant warehouse with a big video screen.
Yes, Tower of Terror is probably the best...
Toy Story...I'd consider an E-ticket. The outside area (Pixar Place), the line being in Andy's room...the Potatohead "barker" and the immersiveness of the attraction puts it at an E (again...for me). Also, the re-rideability.
Star Tours...E-ticket. Now, people would say, "But it's just a movie with moving seats just like Soarin'" but it's not...it's a whole lot more. The entrance with the AT-AT and Ewok Village, the animatronic droids, the little "pre-show video" and the multiple ride sequences makes it an E.
Rock 'n Rollercoaster...borderline E... but a D+ (Make actual sets rather than cutouts and you've got your E).
Everest. Absolutely an E ticket. (although I won't lie...the Yeti really irks me)
Safari. Absolutely an E ticket. (even though it was hokey, I thought the poacher scene added to the point of it...it just wasn't implemented very well)
I would put "It's Tough To Be A Bug" as a higher grade than Soarin' only due to the immersiveness of the queue.
Haunted Mansion...same reasons that Tower of Terror is.
Pirates...E-ticket.
Space/Splash/BTMRR: All E-tickets.
Look at the attractions I listed and then re-evaluate Soarin'. Don't get me wrong, I love Soarin'...but I don't truly feel that it's an "E-ticket." Do I ride it every time I'm there? Yes...but I wouldn't put it on the same caliber as many other attractions.