I have to say the posters that tend to show a pretty strong bias against Disney, seem to be the same posters who think the attraction is lacking.
I don't think it's a coincidence.
This is fine of course, everyone is entitled to their opinion. I just wouldn't base your expectations on someone else's opinion. Try to see it level headed.
That's what I'll be doing. Considering I didn't really care for Soarin, my expectations are slightly lower.
I went into it expecting nothing, and ended up really impressed. Like, my trepidation to accept Pandora as a thing was palpable, even on the day-of with the people I was there with. Even funnier because we experienced it in ideal conditions - extremely small number of people let into the land, and of those people we were given the FOP FP's (no one else allowed to ride outside the FP group.)
We wandered over and did River Journey - while my friends gushed, as they gush over anything Disney does, I nodded and was like "uh huh.. it was ok.." and then we went and got food an drinks. All of us had been there before as part of test openings. We had been assigned which foods to each during the tests, so we got what we wanted this go-round, and we still liked the food. I got the very first Flute Cup they ever sold. It's useless, but it's mine and I shall keep it amid my Disney junk forever.
We chose to walk the FOP standby line because it was empty since only people with FP could ride the attraction. We were rare to the point that the CMs seem confused by our request - but once they figured out what we were doing, and that the standby line was non-existent since no standby could actually ride, they started sending the FP people into it just to see the queue.
Mind you, I was still fully "Uh huh.. right.. Avatar.." all the way through this. Interested in the new offering, but not sold by any stretch, and certainly not expecting much from the ride.
Then we rode, everything worked 100% and I came off an advocate for the attraction. It's very good at what it is. If you're dead inside because you've been on one too many thrill rides and dont notice airplane turbulence when it drops a few hundred feet, you might not notice much from the ride. It's a really well designed aspirational thrill ride.