Normal units one shoting your party and having 2k hp, was quite a discovery and not a fun one. On top of some debuff like the knight, that just makes the fight so long, it spoil the fun. What i'll assume being elite mobs were underwhelming compared to the "normal" ones.
Id also recommend to check on monster density in the snow, that was also exaggerated.
I get the essence mechanic but with the mob doing 10 zillion damage, you are not really incentivize to test it out. Plus only your 2 main companions can gather it, which is weird since they are usually the good dps's.