Wasn't in the least bit interested when it was announced. Now...still not in the least bit interested.
I saw the movie. I enjoyed it. Have no desire to watch it again or see a sequel. No doubt, it sold a lot of tickets, but keep a few things in perspective. It was the largest Imax and 3D release ever. That boosted the money it made considerably. In terms of tickets sold, I don't believe it's in the top 10 of all time.
ETA: #15 in terms of tickets sold.
15th in terms of tickets sold domestically. But of course Avatar made 72.7% of its revenue overseas. Avatar is #3 all-time in terms of revenue adjusted for inflation/estimated tickets sold worldwide behind only Gone With the Wind and Titanic.
Of course some of the older movies in the top 15 domestic list didn't have access to the size of the international market Avatar did, but since its 2009 release, no movie has even come close to touching the money Avatar made overseas. Force Awakens, Furious 7 and Jurassic World, all released in 2015, are the only movies since Avatar to make more than $1 billion overseas (Titanic made $1.5 billion overseas in 1997). None of those three movies made more than $1.2 billion overseas whereas Avatar made more than $2 billion overseas.
Also, some of the movies ahead of Avatar on the domestic tickets sold list have had multiple releases years after the original release that added to their totals. Avatar is a relatively young film in comparison that hasn't had that opportunity. For example:
Empire Strikes Back - 14.7 million of its 98.1 million tickets were sold in 1997 - 17 years after its original release.
101 Dalmations - 23.5 million of its 100 million tickets were sold in 1985 and or 1991 - decades after the original release.
Snow White - 31.5 million of its 109 million tickets were sold in 1983, 1987 and 1993 - decades after the original release.
Avatar would move up to at least 12th domestically if you looked at tickets sold for the original release.
I was actually someone who didn't see Avatar until DirecTV On Demand, several years after its release. Although it was entertaining, it's certainly not anywhere near one of my personal favorite movies. And I wasn't at all in agreement with WDW's decision to add a Pandora-land to AK. But there's no diminishing the success it had at the box office - particularly on a global scale.