OU also teaches 'different' people skills than a traditional uni. I've done both (BSc at a Russell Group uni, and coming towards the end of an MSc with the OU) and what I would say is that:
-Traditional uni gets you learning to live and study alongside like-minded individuals most of which are in the same boat - you are kinda 'thrown together' and thus you don't have to work overly hard to develop people/communication/teamworking skills
-OU uni still requires people skills, you have tutorials on some courses, online collaboration etc and the main difference I've found is that you need to different skills to get yourself heard remotely compared to in person. Also the mix of people is a lot different, there has been quite a wide range of nationalities and age groups on my OU course, whereas at uni it was mostly your typical late-teens/early-20s bunch. Furthermore touching on the 'thrown together' comment I made above, with the OU you have to a bit more pro-active to get the best out of it, you can cruise through uni to some extent and still come into contact with a lot of people, whereas with the OU you need to put yourself forward a bit more to get involved in things.
Not looking to knock traditional uni in anyway, just highlighting that the idea that OU is just some dude sat around in front of his pc working on stuff and never speaking to anyone is a bit outdated.
Moving back on topic the OU is surprisingly (to me originally at least) well regarded by employers.