It made me save/load once or twice to skip the long way around, but in general I like the idea. A step in the right direction towards more realistic exploration if you ask me. And obviously, when you start sliding, you just can't stop in the middle of a steep slope. Momentum and stuff.
What bothers me more is that Geralt doesn't want to grab and pull up on some edges, walls or rocks, which look like they would provide a good climbing path. But making realistic and responsive open world climbing system is really a challenge, so I am not expecting miracles.