Here's the thing though: it's not a binary situation of either loving or hating the park. A whole lot of guests fall somewhere in the middle featuring such states of "I like the park, but it's not my favorite" or "DAK has some good stuff but I run out of things to do", etc. Any improvements and additions can incrementally move people along that line towards where most everyone is excited and satisfied with going there.
I think DAK needs a few more attractions beyond Pandora/RoL to have a wider appeal to all guests. That doesn't mean the park isn't worthwhile now or that it doesn't have it's supporters. And, to be fair, not liking or being interested in DAK doesn't mean a guest is cultureless rube -- different people enjoy different things in different amounts. As many of the folks who go to WDW are part of groups/families, it makes sense to try to have wide appeal by having a large variety of entertainment. You can easily do that without moving away from the basic tenants of the park and keeping it cohesive.
People making the claim that adding more rides to DAK would be "making it like the other parks" strikes me as absurd. As long as new additions fit in to the vibe of the park -- being focused on animals and nature and allowing guests to "share in the wonder, gaze at the beauty, thrill at the drama, and learn" -- then it would only enhance the experience while keeping it distinct. The park can certainly maintain its unique place in both WDW specifically and among theme parks in general while simultaneously upping the total ride count to some reasonable baseline amount that people expect (I'd argue that something like 12-15 rides as a baseline to have a theme park really be "complete"). I tend to side with those who say that with the prices that Disney is charging per day, the park offerings are on the underwhelming side in terms of total attractions even if what they do have is very well executed. And it doesn't have to just be new rides since even new shows or animal trails would be welcome.
And for those who say that DAK is "already a full day park" (and I would agree) -- so? Does that mean it shouldn't expand to become a 2 or 3 day park? Shouldn't any well designed theme park have simply so many things to see and do that you can't do them all and leave with a yearning to go back and see what you missed? I guess I don't understand why people are so content to give Disney a pass for the park being "good enough". Being better than DHS isn't some badge of honor and I'd like to see Disney strive for greatness.