I have access to a credit score service through the identity theft protection on my credit card (had my fingers burnt by this before).
I ignore the score bit, to be honest its a number that means nothing to me as I don't have a good reference or understanding of it.
Where it is very good is the ability to review all credit applications and financial histories. It can be that banks / lenders / credit providers make admin mistakes which go against you, and without the access to the credit report, you may never know these exist, all the meanwhile affecting your credit score. Once you know you can take action to have it corrected.
A simple view of your file will not improve your credit score though, if all is in order, then it is what it is. However if you view it and find errors, correcting them, by your own actions may very well improve it. Also worth noting that every time you view your credit file, this is recorded, although they state not in a negative way.