I don't mind the low polys at all, I love seeing well-designed models with very low poly counts. It's always nice to know you can throw a couple dozen on screen at once if you want. The texture is what will make or break it.
Two things I would shoot for with the texture:
1) Try to avoid really small details. I can see some little wires and stuff in the hull plating, but from a distant view (especially in an RTS type game) these details just look like fuzzy little pixels whenever the screen rotates or moves.
2) Make the model look like it has a lot more polygons by giving good bump mapping to the texture. There can be plates and windows and all kinds of stuff that will sort of stick out from the hull.
Here's a couple screenshots I found via google to maybe give you some ideas:
Ship 1 Ship 2