Casual in time investment, or casual as in "I'm a fucking retard, feed me loot so I feel good about myself"?
I have a big complaint with MMO game design catering to basement dwellers or total morons lately. What eventually started off as evolving towards the middle ground has become self-parody in these games.
Casual in time investment.
Both Operations can be cleared by you and seven others within an hour.
Given that they're on a one week timer, 2+ hours of raiding a week for Normal Mode upgrades isn't bad.
In regards to being a fucking moron and getting loot - it happens. Some of the fights are scaled so that if someone dies (a DPS for example) it's still very beatable.
I would imagine if the group has too many idiots, however, you likely won't accomplish much.