Currently in the process of ripping out WCF and replacing it with ServiceStack. Because WCF is such a pile of shit. If you seriously think WCF is good, and 'trivial' then you're clearly a MS fanboy who've never tried alternatives.

I used to be like you, think WCF was the bee's knees.

WCF promote poor service design, in an untestable manner, has no real support for DI, has terrible configuration, unhelpful exceptions, faults, message size limitations that cause headaches, horrifically slow. The only benefit to WCF is TCP endpoints. End of story.