Ikarius - your points 2. and 4. are definitely annoying, but have been mentioned as game control problems by many others, so hopefully Larian will implement fixes.
As for having trouble with combat in general, D:OS can definitely offer challenges to new players - I'm not being sarcastic, as I experienced a learning curve myself. But I've done a full playthrough of the Cyseal area three times over the past couple months, and can now confirm that at least the beta area gets much easier (almost too easy) if you do the following:
a) pump most attribute points into each party member's "main" (damage/to-hit) stat: STR for melee, DEX for ranged (which I haven't used much), and INT for magic;
b) focus first on the two talents that give you extra stat and ability points, and focus on the abilities that pump your attack damage/reduce your skill costs etc. (the "Way of..." and elemental magic abilities - though apparently these will be overhauled in a coming update);
c) keep your equipment updated - investing a few ability points/wearing rings that boost Blacksmithing will also help you keep your kit in good shape for free;
d) optionally, try a two-member party with both players taking the "Lone Wolf" and "Raistlin" talents at character creation - debatably a little overpowered, but hella fun. With a couple levels and a few good spells/skills, you'll be spamming melee and AOE magic attacks and clearing the battlefield like nobody's business.
Anyway, this is obviously not the only way to play, but it's worked great for me. Since Larian doesn't do level scaling, I've had a lot of fun attempting fights which I at first found overpowering, but which later - with better strategy/leveling etc. - I owned. Hopefully you'll develop your own play style, and find the same satisfaction in overcoming the game's challenges as well. Cheers!
