My experience is that newly extracted honey does feel thin. Over time it seems to get thicker. Warmer honey will be thinner too, maybe that is part of it.
How thick it feels isn't a good gauge since the bees treat sugar water and nectar the same way (its basically the same thing - sucrose water)...enzymes, drying, capping, etc. Nectar actually starts out much less concentrated, typically.
Honey comes in all colors - from water white to flourescent yellow to molasses black. The white stuff is typically the most expensive, so so it sounds like you've got a good batch there! :)
Flavor is most important. If it has little flavor then maybe there's sugar water in there. But I really really doubt it if it is two supers up.