FSX is surely the worst "modern" flight sim that there is in terms of flight dynamics, by a long shot. I (re)tested it two years ago and man... it was bad. Although I agree with you on the whole, no flight sim is perfect but I must admit that DCS helped me a lot when flying for the first time. I've done both helo and prop plane (taildragger and trycicle gear) and the general feel of the aircraft remained exactly the same.