Taking into account what was made public so far, I think this game will be great and will do well.
I really disliked DA2's hyper-minimalistic approach and didn't get ME3 due to its flimsy ending. I thought BW was going downhill with unsavory constraints in time and budget. But this new game seems to be a solid turn for the better.
Some key points are already present and accounted for: immersive and expansive environment, greater companion and PC customization, less restrictive weapon usage, crafting, exploring, mounts, epic backdrop, solid sound effects, music and voice acting. HOPEFULLY this will all be enhanced with a great story that will have plenty of player choice all the way to the end.
I also like the fact that future DLCs for the PC version are finally free from a very restrictive payment method, that the online Keep provides for a really smart prologue, and that the game has been delayed several times in order to make it better - which is rare in the game industry. There's a palpable effort for this game to be the best as it can possibly be and devs have been very open to communication and feedback throughout its production.
That is why I think there's a high probability that DA:I will not disappoint, notwithstanding a likely amount of bugs on release.
The removal of magic healing, only 8 skill slots, and no direct control of attributes will be irrelevant as long as the novel gameplay makes for a satisfying experience. What I really don't like is the lack of modding tools. It's a real shame that EA doesn't want this in the frostbite engine. This is a let down to those, like me, who were pampered by Skyrim. Maybe multiplayer will offset this for a while, but never on the long term.
Anyway, despite my reluctance and skepticism I've concluded that it was worth to pre-order this game. I went so far as to use Origin to purchase the DDE.