(The context here is that I've never really bothered with Cove/Mabar).
I like the challenges, and perhaps more importantly I like the gear they yield. Although some of the stuff looks widely useful, like weapons and the savant biased items, gear like the ring of the stalker, Rock boots and Spare hand seem geared towards players who solo/shortman a lot. Some of the loudest voices on these forums are part of guilds that Raid regularly and have large support networks. There are others like me who are not and rely on pugging or 1-2 friends to play with.
That leads me to my constructive feedback, in that some challenges like Picture portals and disruptor et al are very difficult to solo/shortman.
Big thumbs up from me all round though.