Raleway font - I'm not sure it's hinted for screen?


For a project I'm using Raleway through Google Fonts as a good alternative for Gotham. When I put some headers in a light weight, I get the feeling there's a bit of "warping" going on, so I guess there's no screen hinting apparent. First of all, I thought every Google font was a webfont, and thus adjusted for that particular use... but is that true? Or is it just about .woff-files that are not neccesarily hinted for screen usage?