Im sorry you feel that way. I managed to solve mose of the issues

1) follow the normal start procedure but only do a normal single click on the engine starter instead of holding it down and use the 2d overhead to start the engines.

2) Agreed, the sound could be better

3) make sure the booster pumps and the x-feeds are all open (except the wing x-over unless necessary)

4) I have found that problem only with the ILS when not properly aligned +/-30° from center line heading when intercepting.

5) Never occurred to me.