How does the HD4200 fair against older discrete GPU's?

Well, I found out that on all medium settings, the chipset nabs 34.9FPS on L4D. On 1024x768. That's a perfectly acceptable res for my 19'' monitor (even though native is 1280x1024), and I'm used to all low settings anyways. So with those assumptions, I guess I can play Tf2 and CS:S at decent frames on low settings.