The "pilot" told me that IFR is used on commerical airlines. In that case what is the use of VFR if using instruments is more reliable?
Not all runways have an ILS to them or even a RNAV approach. You have to look out the window to land. Also, you may fly an approach joining final at 500-1000' if VFR, IFR more like 10-15 miles. Fuel saving!
You opted to fly the aircraft IFR. As a pilot, I would prefer to operate VFR, having spent too many hours in cloud! Far more entertaining! This may contribute to your feeling of being let down by the sessions enjoyment factor.
Zero rudder trim is straight head. If it says 15 (either plus or minus) you are going in a big circle, unless you intervene.