Two different tools in my book. Lightroom is not a photo editor. It's a photo catalog and adjustment tool. Photoshop is an editor. It's terrible at cataloging, can do photo adjustment, but shines when photo manipulation is needed. I need both in my tool box.
I agree that they're very different tools, but whether or not Lightroom is an "editor" is simply semantics. I personally own both but generally use Lightroom almost exclusively. Once I get past the basic contrast, exposure, saturation tweaks and get into doing things like massive cloning and liquefying it stops being a photograph and starts being an image (if that makes sense).
So: is Lightroom enough? It depends on what type of work you want to do.

