I love this game, and I love this guy... and that is NOT sarcastic... that is a very honest and balanced dislike for the game... with good points to back it if but abit untested
Level scaling has ALWAYS been an issue with "senor Beth" and I notice after 4-5 repeats of the companions quests... that I agree with the wierd variety in difficulty...
I have not found it too hard at any point... I have found it unbalanced at points...
what I will say is this
due to the level scaling, it doesn't move up seemlessly... my same character on one save did the quests at lvl 10-20 on expert with ease... only getting tough at points.
lvl 20-30 doing the same quests on the same character with the same (but improved armour and perks defence and attack) the enemies seemed to have dramatically different damage and health potential... and not in a way you would expect from that kind of level gap...
My experience is that this guy has done it once and it's really ticked him off and i'l give him that, but on the other hand you can say on another play through it would be different
for example... I did the second/third companion quests (no spoilers) straight through start to finish and it was easy... my save game got screwed and I restarted from the previous save (what a pain in the ace)
I RE-did the 2nd/3rd quests again, at the same level, at the same time I did before... it was like doing it THE EXACT same way... and the enemies were actually different... they were tougher this time... and the boss at the end of both were both easier and harder... first time the boss had a 2Hander, this time he had a sword and shield... and was staggering the hell out of me... and I play carefully... I beat it and enjoyed the challange but that difference with the same circumstances was unexplainable... so I understand this guy....
but I believe replaying the game multiple times will yield different difficulty and different results EVERY time
due to some wierd lvl scaling engine... perhaps it was the route i walked... or the coffee I drank... or the food I ate... but it seems if that were the case... many skyrimmers drink the same coco and eat the same food as me... who knows... but this kid seems to have a point *ahem*
TELL YOU WHAT

give it a try... before starting a quest... save game... do the quest... save it... reload the last one... start the quest and do it again... and tell me that its the same...
I BET there will be mixed results for some of you

ive tried and tested this a few times and it seems to be the case.... some people dont like It and i understand why... but i do... it keeps me on my toes...
especially when you go.... "oh this guy again? hmm il just hit him with .... wtf, how did he just do a finishing move! he could hardly scratch me last time even if I stood still!"