Maybe my explanation wasn’t clear. I was thinking about Ed_RockStarGuy’s comment. Those numerous models are very useful for a blueprint or even for a real game if they exactly fit into the need of the developer but imagine that you create a first person shooter and you start using lots of models from Open Arena. If you want to tell your own story with your own characters, the models of Open Arena are a nice source of inspiration but the skills required to edit them are close to the skills required to make your own models from scratch. I admit that my sentence that you quoted might sound silly as it is obvious that you can’t find the models that you would have created if you could do so. I think that I made a mistake in 2009, I didn’t imagine that I would have to learn to use Blender because I thought that I would be satisfied with slightly modified models but the only well animated model that I use looks like a ripoff of Quake 2.
As a conclusion, I mean that those models are a lot better than simple placeholders, they are helpful but at some point you’ll have to learn to use a modeler or to ask for help. You can find some models that can be used as is but I’m skeptical about making a game exclusively with them.