The fight is very easy (there is what... 5 mechanics to look out for?). It is just long, repetitive and does not allow for many deaths.
Which is in stark contradiction with the new primal that is very mechanic heavy, each encounters feels almost different and you can die a lot an still meet the DPS check.

Shiva is just not fun IMO.
While I LOVE the new primal, and find it a pleasure to farm, I don't think I see myself doing Shiva even twice per week... for a recycled mount I won't summon and a necklace I wont use?
I just don't understand the point of it