sneak is one of those useless skills that is not worth to put points into in this game
with that much movement speed reduction, and easily cancel if teammate enter combats, plus the crit gain for sneak isn't much either
so yea-.- if it's for traveling just go on your mount, for crit HF(still not worth putting point into) would be a better option.
Sneak is really useful, but more so at high levels and only at PvP. I used it, didn't see a huge change in Crit Rate and stopped leveling it. Then, I square off against a level 65 Thief who maxed out Sneak and buffed up to about 70% Crit Rate, where every little bit counts.
The Crit Rate only lasts for one attack, but it only took one to smash me with a 15k Crit.