I tend to use medica 2 over medica, I've never pulled with it because bumpy the time I use it the tank has agro well established and I try not to let parties get into that state.

Use it when the whole party takes unavoidable aoe damage or after phase aoes in primals. Only time I use cure 3 over medica 1/2 is on xande's levitation platforms because everyone is bunched up together and I just cure any stragglers cure 3 doesn't hit.

Also please don't use it just as tanks pull, one did that to me in ultima and...um...she tanked for QUITE a while after ._.