It entirely depends on why you are claiming it as an exclusive. In the console warz, the list wars battles are never about which company makes the $$. It's all about which company sells the most consoles and has the games that will help to sell those consoles. In that context being on PC and Xbox is significantly different to being on Xbox only. PC/Xbox exclusives simply do not propel Xbox hardware sales as much as Xbox only exclusives. And in the fight between PS and Xbox it's the number of hardware units that are sitting in people's homes that matters.
If you are a MS shareholder, then it makes no difference whether it's Xbox exclusive or MS exclusive. But the vast majority of shareholders are not poking around in forums like this taking sides in the console warz.
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