I think the rides will be good and provide much needed capacity when it rains. Food looks fine to great and I bet it gets tweaked over the next few months to one of Disney's better counter service locations. The app based ordering will be a turning point in parks and lots of locations will start using it (this might be Pandora's biggest legacy). The drinks lack logic or appeal; simple usually equals better. I expect the interactive and glowing plants to be overrated and will lead to a lot of "that's it?" comments. Merch won't move like Disney hopes.
I've always been more interested in the "outside the berm" aspects and impacts of the land. I don't think this will hit Disney's targets and we'll see that through delayed or canceled projects that people swear are green lit now. I don't think guests will make two trips to see this land (one during the day and one at night) and DAK shifts from an EMH to early afternoon park to a late afternoon to closure/EMH park due to RoL and Disney trying to sell the nighttime effects. DHS will take an attendance and profit hit but I think Disney's expecting this. I think Pandora will be a mixed bag of success and disappointments for Disney, some of which are design related, some of which are self inflicted, and some of which are due to James Cameron.
The Usual Suspects will come out and decry this better than anything done so far and specifically target Harry Potter (similar to praise for LeFou's Brew and New Fantasyland over Butterbeer and Diagon Alley). Due to the sheer number of AP's and DVC there will be lines to get into the land initially but this will all but disappear over the summer months (see Jock's and Trader Sam's for examples). I think general consensus will fall on "it looks nice, rides are fine, lacks soul" and the general public will only connect to it on a "alien planet" level. This might sound ok initially until you remember Disney's forking over money to Fox for something guests will mentally throw away.
In the end Disney's "Potter Swatter" never materialized due to factors in and out of their control.
For the most part my thoughts echo Joe,
The food looks fine, even though that's something they had to make up instead of plucking straight from the scource. The drinks however, unlike the food they don't look or sound tasty whatsoever. (Let's make a non-alcoholic drink with mango powerade, said no one ever.) For merch, I don't see anything that's going to be a real big seller. It's not going to pull in the numbers Disney think they will. As for the app based ordering system I do like that, and I'll agree that could be Pandora's biggest legacy...which that in itself is very concerning consider that app based system to order food has nothing to do with the land itself.
As for the land itself, it looks "nice". It's not ugly, but my jaw ain't dropping. I know they've been putting a lot of effort into the "floating" mountains, but it's a painfully telling sign when Whoopi Goldberg was being shown around the land, and James Cameron -had to point the mountains out to her- and her reaction was essentially "Oh, that's nice". It wasn't the "OMG!" reaction they were hoping for, especially for the lands thematic weenie.
For the rides, Flight of Passage never really had my intrest since from the very beginning it was refered as "Soarin' 2.0". (For me, Soarin' goes under the "nice" catagory. It's a nice ride, but I don't hold it up as one of the Disney greats since at it's core, it's just a flight simulator in front of a lone screen.) From everything that we've seen of FoP, Soarin' 2.0 is dead on. They've added 3D and you're in a new flight simulator vechicle pretending to fly in front of a lone curved screen. It's probably gonna' be decent, but it's not a draw for me. (Now if you wanted a attraction that would've got my full attention, something like Peter Pan's Flight/Mack Inverted Power Coaster on a grand scale would've easily done the trick.)
Now with Navi River Journey, out of everything in this land I was the most intruiged by this. You can do a lot more with a good boat ride, much more so then a flight simulator. But unfortunately with all they've shown of this so far, I have to lower my expectations since it looks underwhelming. It may look "pretty" here and there, but if there's one thing I learned from RuPaul's Dragrace is you can't rely on pretty. Since there is such as thing as pretty boring.
Believe me, I would love for my thoughts to be proven wrong about this land. But I've got the deepest of gut feelings that while food will be fine and things will look nice, it's just not going to meet whatever expectations Disney has for it. Yes, I do think it'll take attendance away from DHS for a year or so. But there's a nasty kicker on the horizon in the form of Star Wars Land, for that won't just take attendance back and then some, but I see that land having a major revisit factor...something I don't think Pandora has. That doesn't bode well short term and most certainly long term, since once SWL -and- SNW are here...a land that's set 20 years in a already far future will feel a thing of the past.