So if you're shooting more threes and are still right around league average for three point %, it stands to reason that you would be a better-than-average three point shooter.
If you expand the search out to 350 attempts, you're still looking at a who's who of great three point shooters in the league:
http://bkref.com/tiny/5tsKI
Food for thought: if you're a bad three point shooter, you're not going to be allowed to take that many shots from beyond the arc.
That's true. Trevor Ariza is clearly one of the elite shooters in the league, and you can tell that because he was one of 5 players whose team trusted him to take 500 threes last year.
If you don't think Trevor Ariza is a good three point shooter I suggest watching more basketball before you try to talk about it.
I would also suggest that you investigate the way the Houston Rockets play basketball but, again, that would assume that you actually cared about having a discussion instead of making generally useless points.
Thirdly, I would say that if you're shooting 'league average' with a sample size of 500 threes over a season, in a league where (as previously pointed out) the actual average 3FG% is something like 31% would make you, well, well above average. That assumes, again, that you actually care about having a conversation instead of wasting time with pedantry.
I would finally suggest you take your, shall we say, sub-optimal ability to parse irrelevant information to prove a incorrect point onto your phone and dial up your local sports radio station. I think they'll be more receptive.