Well, I have been to a 'regular' University (Aeronautical Engineering at Southampton University, but did not complete the course), later got a 2.1 in Maths & Computing with the OU, and a few years back completed T189 (Digital photography: creating and sharing better images).
As a route to a degree I was very happy with the OU - the attitude of everyone involved seemed very positive, with an emphasis on rewarding you for demonstrating knowledge / understanding, rather than penalising omission.
As already mentioned, it is important you select courses that interest you, as motivation is important - there is an element of interaction with other students & tutors, but much of it is you sitting on your own at home studying - and if you are not motivated it would be easy to let things slip.
Regarding the photography course specifically - I took this to try and learn more and to improve my photography - which is what happened, but not as much as I would have liked. The reasons for that were a combination of the course design, my personal circumstances, and the British weather!
I took the autumn presentation of the course; my wife and I both work full time, and we have two young children - so mornings are fully occupied (I have to get up at 5.30 to walk the dog as it is!), and evenings are occupied until the children are asleep (8pm or so).
So during the week I could study later in the evenings - this was fine, but going out taking photographs meant finding a slot on the weekend - weather permitting!
I was able to get something every week, but continually felt I was having to rush to do so, when I would have liked to have been able to take my time and properly consider the shots I was taking.
Anyway, in the end I passed (final mark 76%, as I recall) but several of the shots in the 10 image final presentation (80% of total marks) were taken before I started the course!
Would I recommend it?
The answer is 'Yes, but...'
To get the most out of it you need to be a beginner, but to have had your camera for a couple of months at least, so you know the basic controls (EG How to select Aperture priority, and then adjust the aperture) - the course will teach you why you would want to use them.
You also need the time to go and try what you are learning. If you can get away for a 1/2 day every week this should be plenty, but the flexibility to look out of the window on Saturday morning, see the weathers nice and say "I'm just off to take some photos while its dry" makes things a lot easier.