IF they are the type of ones that teach you how to write essays and papers etc for Uni then they will be worthwhile. Boring as bat poop but very helpful if you need a hand with academic writing. One thing I have heard about Open Universities from someone who was doing a teaching degree there was that there was a huge online component and she was finding she'd have to spend 2 days on the computer just to keep up to speed with the modules as they had to make a lot of online contibutions. THis may be different for the degree you are aiming for, but it put her off enough that she has deferred the rest of her degree and is trying to change Unis as it was too muc for her to keep up with.