I studied there.Graduaded with £15K debt. While it's highly accessible,the quality of studies is a bit hit and miss tbh..
I found the material of good quality, and the tutorials/lectures I attended were fantastic. I did, admittedly, feel that the level of support could've been greater, but for a predominantly distance learning education that's par for the course, IMO.
The debt is indeed a bummer! Still, their fees are lower than most other UK universities right now, and my study landed me my current DevOps position, so I'm very happy.
While I didn't personally feel like I needed support, there were others in my tutor groups that did, and it was apparent that the level of input from tutors varied wildly - I recall one that offered weekly 1-on-1s for anyone that wanted, and another that took days or even weeks to respond to any query whatsoever.
My wife is now studying at the OU, and her more contemporary opinion echos everything I said above.
I studied at a university that regularly ranks top three in the world, and felt exactly the same way...