Sounds dodgy to me. What if say you were moving furniture and knocked the cable a bit loose, then a 3-year old decides to swing out of it - sometime down teh line you'll end up with a problem.
Was there a reason they weren't put into the walls? Also you'd need to check that these new cables aren't allowing you to plug a TV into the same MCB or fuse as the lights for the various rooms. As far as I know, there is a subtle difference between the lighting circuit and the other circuits (e.g. for cooker or sockets around the house). I think the difference is in the earthing or protection, so that it will work, but is less safe than doing it by the book.
Sounds like a bit of rewiring, plastering and painting to be done, but the benefit will be that you decide where you want the new sockets.
PS I'm not an electrician, but I'd advise you to get one to look at it!