Gladwell's english was very approachable, so outliers was an easy and enjoyable book to read. I even believed it the first time I read it. Once I read his later stuff though, I noticed a couple of things that didn't quite add up for me, and that sort of shone a light for me on the pattern he was using. I wouldn't put any more weight on his work now than I would on a random blog from the depths of the internet.
He's a genius writer and we should be aware of that when reading his books. He could influence us. I think that 10000 hours means that long-term. No shortcut for master anything.
I would not call him a genius writer by any stretch. The sheer number of people who consider him a complete fraud part of that reason. The rest is that I've seen enough of his material that didn't add up for me.