"House" is a high-budget series with great cinematography. They usually use professional film equipment (ARRI cameras, Cooke S4 lenses, Fuji Eterna film, processed on a 2k Telecine) which offers high MTF at HD-resolution, impeccable color rendition and dynamic range, lack of nearly all artifacts (expecially alaising, clipping, motion artifacts) besides extreme reliability, rugged processes and professional handling evolved from the needs on a film set over decades.
Sure, a skilled cinematographer with experience in handling the shortcomings of it's equipment can create an interesting look even from a 5DMkII or basically from any HD-video-system, just like a skilled racedriver will still be faster on a racetrack with a heavy limousine than an average driver with a sports car made for racing...
That's not the point, the equipment is used to capture the vision of the artist, it must not dictate the look by certain artifacts, limited DR, handling, color rendition...
Professional digital video cameras offer uncompressed RAW-recording (1080/24p uncompressed at 16bit color depth results in a nearly 50times higher data rate than the output of the 5DMkII!!!), just like all professional still photographers use it as well, they cost a fortune and still don't deliver any noticable advantage over film, especially not 35mm (in fact, their artificial "video-look" (skin tones, limited DR, highlight clipping, motion artifacts) is usually easily noticeable even in SD-broadcast) - at least the newest generation seems to offer an advantage in sensitivity over film, just as we now it in still photography for some years. An HD-capable DSLR is far from an ideal professional production tool with it's highly-compressed video-output, horrible artifacts (rolling shutter) and an handling made for (amatuer) still photography - not a film set...
It's an interesting experiment, but even the "rational" arguments for it are simply wrong ("limited DoF" - a wide range of T1.4/T1.3-lenses is available for S35mm which offer a narrower DoF than a FF-DSLR at F2!). The equipment they use regulary offers a higher technical quality, better handling and more artistic possibilities to manipulate the visual style/image - it's the better tool for this job (basically for every >1M$-project when stock costs only play a role in the eyes of the producer).