Oil usage isn't a bad thing (putting a few litres of clean oil in between services can only be a good thing for your engine)
The amount of oil an engine uses is generally dependant on how the engine was run in. On the new polo 1.4TSI's, the ones run in hard (high revs, load etc) use LESS oil than the ones run in gently
My car uses around about 1 litre every 2,000 miles (although I never let it run low) so I won't be worried about your consumption
Most VW engines use a bit of oil. You won't see it burning it (ie. Clouds of smoke) it will be very subtle
Graeme