I agree with you. I use a surface pro 3 as my daily driver but I have two 23" monitors I plug it into. I can only use the 13" screen for movie watching and reading.
If you have it plugged into two monitors I'm curious as to why you ended up buying a surface pro.
I bought the SP a while ago, before the two monitors. If I had my druthers I'd go with something more powerful. Either a dedicated desktop rig or a beefier laptop