Hi M and welcome.
I think there are two important points to make.
Firstly, this site isn't fair representation of overall Morgan ownership because not all Morgan owners are members and even then, not all members post (many choose to just read). Therefore, the comments posted tend to fall into 3 camps: I have a problem and can anyone help, I love my car and, lastly, general chat. The complaints are a small percentage of the topics on the site and an even smaller percentage of owners experiences (if you consider the non-Internet owners).
Point two, Morgans, as you know, are hand built. The reason the first service is so important is because despite the build being carefully monitored and to documented standards, the cars do loosen up with miles and thus need a post break-in service. Many people comment on how their car feels like new after this and in reality, it is because the mechanic will go through the car and ensure it is back to factory standard; after this, the cars are very easy to live with and in most cases problem free.
I hope that helps. In my case, I've had niggles with new cars but never anything that has not been able to be resolved by a good mechanic.