For me a returning subscriber when the expansion came out I'm seriously disappointed in the how stupid hard the HK quest line is. I can't image anyone thinks it's fun spending several hours solo (since most already have the HK) scanning huge areas.
I've spent 2 hours at the Dark Temple and still not found the part. Very sad and disappointed in the whole thing, 16 second timer on scans, mobs all over the place, huge areas to scan = not fun.