Why are mdps specs so popular on Lordaeron?

[Xxanarg]

I play on both Icecrown and Lordaeron and I noticed the population on the latter is heavily weighted towards mdps, particularly the plate classes. Whenever a pug raid or new raid core is formed, mdps spots are filled almost immediately (particularly warriors and DKs), while raid leaders quite often find it hard to fill certain rdps spots like boomie, lock, or hunters. The shortages in these classes can be so bad, I've seen raid leaders take even the ones that would not normally qualify (e.g. 6.1k gs hunters doing 5k dps or 6k warlock doing less damage than the tank).

On Icecrown, I notice the population is more balanced -- it's not uncommon to see raids fill mdps spots last, which is practically unheard of on Lordaeron.

Was just wondering what is it about Lordaeron in particular that makes people gravitate towards mdps or avoid rdps, or both.

[zorino]

It will just be a coincidence, I don't see this great disparity between melee and ranged.