There is no global patent, so patents are ultimately subject to national jurisdictions. Different patent offices have different legal provisions and different case law.
From my European perspective, I’d say the EPO has a very stable examination framework for digital patents (or computer-implemented inventions, as they are called correctly) – from a birds-eye perspective. This allows relatively accurate patentabiltiy predictions in many subfields of digital and software patenting. But reliable doesn’t imply easy.
I just started a poll on LinkedIn to ask my network “Which patent office is most favorable towards digital patents?” What do you think?
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