I actually have the opposite view of those that say that the 1.4 is too small to for 3400 pound car and that it will cause issues.
Turbos require to be spooled up often and build boost in order for them to work properly and have no issues. The worst thing you can do to a turbo engine is to stay off boost and keep the RPM low.
With that small engine and a hefty curb weight, GM ensured that the engine and the turbo will have plenty of "work out", remember this is a commuter econobox, people will drive it like a regular Corolla or Civic, if the engine was bigger and had more horsepower, people would simply use less throttle, which is fine on an N/A engine, but is bad on torbo'ed engine.
As long as proper oil is used and changed at recommended intervals, I don't see any problems with a small displacement engine that is worked a bit harder.