I think the solution is simple, when there really is something wrong with the MP functions why dont you post a bug report?

Project failure is always sad but there can be many reasons for that and if they are not technical you cant blame Gamestudio. You say only some guy told you this and another guy told you that, but when you worked 5 years with multiplayer you should know yourself very well which of the MP functions does not work. When all functions work and your project failed nevertheless its not Conitecs fault. But when some MP function really does not work, put the problem on the bug forum and it will be fixed and we all will be happy.