I absolutely adore the reflectivity in those signs. On the other hand I'm not sure the font is correct for the "engraved sign" look. Yeah, TF2 has its characteristic fonts, but those are used in the UI and menu screens for the most part. When you take a look at some of the overlay signs they use fonts appropriate for the types of signs they are. Go ahead and use a nice clean font with sariffs. Copperplate Gothic or something along those lines would do nicely I think.
Also, the one sign is too big in my opinion. Usually these types of metal engraved signs are used as placards, not large directional or informative signs. Keep them smaller and make a variety of them! I'd like to see some that could be used as cornerstone markers, "EST. 1957" and the like.