Well, as far as FoTM goes... For boxers it's a bit different. Probably the majority of us feel like we are pigeon-holed into certain class combinations when making new teams. For instance, I like to play 5 of the same class, or 5 very similar classes. It makes things flow much smoother imo when questing around the world and PvP'ing. It is also a lot easier to set up macros for 5 of the same class and you possibly have less to think about when choosing how to handle situations in the world.

Another factor is class combination effectiveness. Melee classes do not seem to mesh well due to positioning. From my experiences, having ranged attacks is a blessing. I'm taking a break from a team I was leveling that consists of four shamans and one paladin, all of which are currently level 48-49. I think I'll add that this team makeup is awesome, and very viable for instance running. Shamans tear stuff up, and so does my pally with 16 totems backing her. Anyway, back to the topic at hand. In non-instance PvE I find that the paladin doesn't really do much other than buff the group and lead the shamans around while they tear stuff up before it gets to the group. I just tried a group of all melee characters and it just seems so much less efficient, and not worth the trouble to me. I know some people who enjoy it though, so I'll leave it up to you to decide.

So at this point in the thinking process most people have probably come to this conclusion. I want multiple of the same, or similar, classes for ease of use. I want something with ranged power, so I don't have to be constantly bothered by positioning myself for every pull, or PvP encounter. So rogue, warrior, and paladin are all out. That leaves six classes. When you add up all the pluses of five shamans, obviously they are the main point of interest. For starters, they have both PvE and PvP encounters well under control. They can deal with the fear, which is our number one enemy in PvP. They can deal with AoE. They are very tough to take down from a melee perspective if they have a shield equipped and a few totems up. Also tough to take down from the caster side of things due to grounding totem, immunity to fears, multiple spell interrupts, and the list goes on and on. Shamans have the best stackability(is that a word?? ) It is no wonder at all they are the FoTM. Everyone wants a piece of the pie. You shouldn't be surprised when they take their share of it. It's pumpkin after all.

As for druids, they are quite desirable as well. They can all stealth everywhere, which is obviously a huge bonus to awesome factor. At 70 they have very scary ranged attack dmg... Multiply that by 5. Five starfires on my head? No thanks. Moonfire dot does indeed stack. At 70 moonfires hurt badly.. They have good range, are spammable, and instance cast. 15 treants is also something that would peak the interest of many. The dmg reduction of moonkin form is also very desirable. For fun add in some roots, cyclone, free insta-cast flight form(I have a 70 druid and let me tell you flight form is a blast), five moonkin dances, and the relative uniqueness. Though, if you happen to be night elf, you can't cast starfire from shadowmeld without it breaking.. Lame I know. You'll probably be in moonkin form anyway, but I think this should be put out there.. Rejuv stacks. Wewt. Spec one into feral and you have yourself a very efficient tank. Spec one resto and you have a great healer.

What I'm trying to say is that some classes just mesh very well together. Some class combos work better for multiboxers. Most people look at all the benefits, and are drawn into choosing classes that seem to be built for boxers. Like what stacks, how far they will be able to progress into PvE territory, how well they can do in PvP with their team, and fun factor. Shaman and druid should be pretty high up there on the list.