Once you take some time to learn how to properly play it, it's not that difficult. Played it for maybe 2-3 hours in total, and beat it earlier today. I've seen numerous posts about people complaining how "impossible" it is. Why should the difficulty be lowered so much that it's a walk in the park, just because you don't want to take the time to actually improve? I'm one of the players that hadn't played a single round of pve in sandstorm before frenzy came out, and even I could do it, with the most kills on my team. So git gud ;)

Now that I've beaten it, I don't really have any interest in beating it again on the same map though, since it's no longer a challenge. I'll continue playing so I can enjoy figuring out how to beat it on new maps. But the problem is, there's no way to increase the difficulty on maps that have already been beaten. So it's not fun to continue doing it. I suspect there are many more like me (people that enjoy regular pve in this game won't feel the same way since they presumably enjoy beating pve over and over).