Coming from playing a lot of 5E D&D, I found the game overall to be quite easy and I didn't abuse barrels, stealth, or backstabbing (I wasn't expecting the latter so I didn't realize what it did for 3/4 of the game). I did try to get a height advantage where I could, but found that I sort of needed it for the Wizard/Warlock to have a decent hit rate. My Ranger was always had such a better hit chance (ranger bow option, +1 weapon). As it stands, I'd probably bump the difficultly (once there are options) up one notch to make it more challenging come release, unless something drastic changes. Using jump to disengage and being able to do a regular action was very strong for all my ranged classes. As much feedback has indicated, all the surfaces you can get with cantrips is very strong right now.
