I have had a B7 2.0t 6mt Avant for 3 years and love it. Oil consumption isn't that common, however those who do have issues have a hell of a time trying to figure out the root cause as it can be many things. I think some of the late B7's had the same improper ring installation as the B8's did but that should be covered under an extended service bulletin.
BY FAR the biggest issue with the B7 2.0t is cam follower wear and failure. Had mine go and destroy the entire top end of my engine. Very luckily for me, it was all covered under the extended warranty which I believe has now expired for the B7 platform. Before buying any B7 make sure you or a shop checks the cam follower and lobe on the cam for excessive wear or signs of a past failure.
Most guys replace their cam followers every second or third oil change just to be safe, it's not supposed to be but people treat it as a wear item that needs to be replaced regularly.
Another common issue is oil pump failure, there is a 1.8t oil pump retrofit that some guys do, there are some performance benefits and the 1.8t oil pump is far more reliable.
Every platform has its issues. There are a lot of guys who maintain their cars well and also beat the crap out of them (JHM Tuning guys for one) and have no issues. The 2.0t is a pretty robust engine if it is looked after properly.
Some inspiration for you:
My B7 started life as a bone stock, non-Sline but is now one of the sexiest B7's around!
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