I'm putting a second answer as I wouldn't use the word "negative" at all in relation to multi-level flavours in champagne, exspecially Cristal which is especially dense with layers of taste.

Here the main two flavours coming through are the "Mature nose, in a heavy white molasses direction" but which is not "as expressive as old Cristals usually are" so not as strongly expressed as usual. This is not necessarily a hugely negative aspect, just that it is not the usual taste of old Cristal.

However, the other aspect is (like old Cristals : "Its palate was more like it"...note it doesn't say it IS the same as usual , just "more like it") as its "still tasty with orange blossoms, game and a sweet, big, nutty finish"

So, the "two-sided story" that has everyone talking is that it is like a usual old Cristal in some ways but not in others (but that might be a good thing!)
The whole bottle is an "affected bottle" (affected by what??) as it is not the usual Cristal flavour. (I'm assuming here that "affected" doesn't mean "corked" or they wouldn't be drinking it at all).

Some tasting notes on Cristal
http://mmdusa.net/champagne-louis-roederer/Cristal/ratings-r...
http://lecaveau.ie/shop/cristal-roederer/

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Note added at 12 days (2015-08-15 08:56:55 GMT) Post-grading
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glad to have helped