I wouldn't dare argue against it, as that would just make me a hater. And if there's one thing being an NBA fan in 2016 has taught me, it's that dissenting opinions are sign of bitterness and hating, and you should just shut up and have the correct opinion.

In all seriousness, it's been a noteworthy and historically significant season, with a lot of great moments. No question about that. I think best ever is pushing it though, at least at this stage. There have been other seasons that are memorable for their own reasons, and you've got to be careful about calling the latest anything the best ever. There needs to be time for the hype and the moment to pass, and everything to be put into perspective when you make comparisons.
You also have to consider the elements of this season that aren't so positive. An uncompetitive, snoozefest of an All-Star Game that pales in comparison to the great clashes of the past where players defended a little harder and didn't just chuck threes. A couple of teams tanking hard and setting dubious league and franchise records along the way. Only two teams topping 60 wins, with only two real contenders and the Western Conference Finals essentially deciding the championship, more than likely. The rookie class has a lot of potential, but they're still a ways off realising it, and they're not exactly the classes of 1984, 1996, or 2003 just yet.
I wouldn't say it's the best ever. It's not that it hasn't been a great season, or a memorable one, but the NBA's been around 70 years, and there are a lot of memorable seasons that are in contention for "best ever", "most memorable", "most historically significant", or whatever. They can't be so readily dismissed as being surpassed, especially when this year's Playoffs aren't even in the books yet.