Perhaps relevant is that we have also been very bad at modelling the recent and short term future climate of our own damn planet!

Things are finally settling down to the point where models match independent data, e.g. the recent research into sea level changes as measured by satellite.

So now, finally, we can start making informed policy choices based on cost benefit analysis. (Actually, no, who am I kidding - Greens worldwide will keep hating on industry and capitalism, and everyone else will keep pretending AGW isn't real. But at least we could start forming rational policies if we wanted.)

Back on topic, to assume that we can make any kind of predictions about the climate of life bearing exoplanets seems like the height of arrogance given the state of the art in climate modelling.