Who hates trying to work out what a complex C# method does that you didn't write? I know I do! Now who also hates writing the aforementioned comments... yep me too again! Along comes GhostDoc... a nice little plug-in for Visual Studio that automatically generates XML comments for your C# code! All you need to do is hit the hot key (which you can define) or right click and choose "Comment this..." and bingo a method or property you had selected now has a comment. GhostDoc uses some clever behind the scenes code based on the name of the method/property and the data types involved to make a "best guess" effort on giving it a comment  - now I admit some of its suggestions do provide a few comedy results - but either way its often a good starting point!

I suggest you give it a go...

http://www.roland-weigelt.de/ghostdoc/