Sounds like we're doing similar stuff. The code I'd like to run under Mono is neither ASP.NET nor WinForms. It's plain vanilla string processing and HttpRequesting with some minor crypto and SSL thrown in to use AWS.
That's the stuff I'd expect to be there and it's not.
That's the fun part. The tool says everything is good to go. That's partially why I felt so burned by it, having assurances that everything I was doing was implemented. Running the code, it doesn't even thow. It just quietly exits.
After a few weeks running into issues like that, I just quietly exited myself. Windows EC2 boxes are only 25% more expensive than Linux ones, and they run .NET natively and correctly, so my particular problem is solved.
That's the stuff I'd expect to be there and it's not.