I`ll try to give you some input based on my feelings and experience, after 11 months of ownership of a 2.0T FWD:
No question that a V-6 would have more kick than a I-4 with no turbo kicking in....and that the '6' will have more get-up and go over the full RPM range...Coming from that V-6 to the 2.0T has to be a 'let-down' for you.
One of the concerns with some 2.0T owners is that the power band is not broad enough for their liking....For me however, it gives me all the punch I could want when making a high speed merge, or over-taking and passing a long line of traffic. The turbo torque seems to end around 3300-3500 RPM...given that at 60 MPH, the RPM`s are only about 1900, that leaves a lot of turbo punch left to hit 80ish, quickly.
Back in the cold months when I first got it, my combined MPG was averaging 21-23.....Now with warm weather, summer gas, and 9,000 miles on the clock, my combined MPG is 25-27...Pure highway driving now nets me 30.8....That`s figured pencil & paper, not the on board computer, which is always more optimistic.
Engine noise?....Sometimes it`s so quiet when at a red light, etc, I have to check the tach to see if it`s still running.
The tranny shifts smooth and quietly, no complaints there.
How many 2.0T did you test drive, and were they AWD or FWD?