It was bugging me, so I looked it up -- knew I wasn't nuts.

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Planets Formed in Habitable Zones of M Dwarf Stars Probably are Deficient in Volatiles

Authors: Jack J. Lissauer
(Submitted on 22 Mar 2007)
Abstract: Dynamical considerations, presented herein via analytic scalings and numerical experiments, imply that Earth-mass planets accreting in regions that become habitable zones of M dwarf stars form within several million years. Temperatures in these regions during planetary accretion are higher than those encountered by the material that formed the Earth. Collision velocities during and after the prime accretionary epoch are larger than for Earth. These factors suggest that planets orbiting low mass main sequence stars are likely to be either too distant (and thus too cold) for carbon/water based life on their surfaces or have abundances of the required volatiles that are substantially less than on Earth.

http://www.arxiv.org/abs/astro-ph/0703576

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Hope the guy is wrong but does show the sorts of details that need to be looked into rather than assuming that "large rocky planet with surface temp 0<x<100 oC = OCEANS!"