Personally I would just pass all the route parameters into the action method over using func_get_args with that said, coming in Laravel 5 we have FormRequest objects which will contain validation/auth rules aswell as all the URL parameters so your controller actions will look something like:

class ArticleController
{
    public function read(ReadArticleRequest $request)
    {
        // $request will have all url properties
        return 'You are reading article ' . $request->articleId . ', slug: ' . $request->articleSlug;
    }
}

These FormRequests are going to be an absolute godsend, if you are not ready for production you may want to bump your version up and use the current dev-master branch of Laravel to get early access, we are only a few weeks from release after all.