For my pal/sham crew - some quick observations:

Rogues:
smart rogues (2+) pretty much stomp me with sap/blind
geared and smart single rogue can usually sap my pali and drop at least 1 sham before I can scare them off or kill 'em

not-smart: rogue that assumes my paladin is heal specced and tries to kill him first before laying into the sham... <splat>

Mage:
smart: highly mobile AoE + frost nova can drop me right quick
smart x2: charge in looking like a highly mobile AoE mage then ice blocking right before the first lightning bolt salvo hits, usually in conjunction with Mage2 who then proceeds to AoE me as above.

war/priest/warlock:
not-smart: fear bomb classes that don't notice 3x tremors and charge in thinking "yay free kills!"