Why are mdps specs so popular on Lordaeron?

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.

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

answer is shadowmourne

Melee dps are just more appealing.

You don't have to waste 32 bag slots for Soul Shards to get 1 AFK to accept a summon. Or another slowly witted player to click on that Healthstone the first time you summoned it, that's if you get players to click it in the first place. God forbid if you ever AFK for 1 minute without dropping a TV..
Demonology Warlock: What is my job here? RL: To make others look good. Demonology Warlock: Oh..
Only 1 pet reliant spec.
No ugly druid forms.
No need to pray RNGesus for two crits in a row with 70% crit chance.
Totems? Aren't you resto? No? Oh, awkward.. *Totemhance has left the raid party."
No need to channel Mind Flay.