Lightmapping issues in Unity..

Hello everybody!

First of all I want to say that I love Unity. It's such a great engine, really powerful and easy to understand, but for as long as I can remember I could never get normal, decent lightmapping results.. It's just such a pain in the ass.. I checked lots of threads, documentations and ect.. about lightmapping, but It never worked for me. I am using the 2nd UV channel for lightmapping, the settings are usually like the default lightmapping settings but the result comes with lots of artefacts.. I probably don't even need to show the result, cause I think a lot of people have the same problem.. I even checked tutorials that showed how to lightmap. The results in the video are great, but when I do it, same thing, same assets, it looks horrible.. Why is that? I do not understand this at all.. Like I said I love Unity, but lightmapping in Unity is just being really not nice to me..

Can someone who can lightmap in Unity tell me that big secret on what am I missing? Cause I'm getting really hopeless right now.. Thank you!