I do not have a druid team to 80 yet, but i do have a mixed group and the classic Paly+shams. My guild mate has 5 palies and a few ways to do a mix group as well as the paly+shams. We both feel that mixed groups are viable.. so are 5 druids or 5 pals. BUT like others have said, paly and 4 shams are by far the easiest, and for me, the most fun over all.

I have fun playing almost every other class MORE than shams "solo", but stacked they are the best. I solo my mage..hunter..druid in pug raids all the time. It gives me a 'fix" of wanting to try something different. Then I end up back on my main team. Paly+4 shams FOREVA!