Two factors required to make a profit on the punt.
1. Picking winners
2 Getting value for every bet you make.

For those with a limited time to devote to those tasks they will probably concentrate on the area they think they do best at.The trouble is that spending the majority of your time on finding winners wont do you much good if your not getting value from your betting, especially if your form analysis throws up the same findings as the general betting public. Even though I enjoy doing weight ratings I find that the time they take to do thoroughly gives me less time to concentrate on getting the best value for them. I guess the bottom line comes down to the question, Are you making money from your betting over the long term?? If you are then keep going with what you are doing, whatever the method.