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It all depends on the conditions present. Mars is habitable, to the extent that it is, because of what we've found there and assume we can use to make it habitable for a base/colony. Doesn't mean it will be easy or even possible in some cases. It means we can see all the resources we need are present and we may be able to exploit them to live there.
Is Earth so hospitable to life?? Think about it. Try and live in the Sahara with what you've got, now. You'd be lucky to last a few days, if that. Even worse in the Atacama Desert...some places there haven't seen rain in historical times...more than 400 years. There's plenty of places on this planet that aren't too great for living in.
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