The SNP, as you probably know, was able to take power after that. Clearly, in order to do that they had to win a good part of the individual districts as well. This was, I guess, a way to break through the system originally. Depending on how you feel about Scottish independence, you may say it was a good thing or a bad thing, but putting that aside, I think the system worked as it should.
For a party to represent an important tendency that has been under-represented by the existing system, to enter because the new system represents the parties much more proportionally is a good thing. They are then in a position to present their ideas, reflecting their strength within the population. There were clearly other things happening at the same time, but that certainly helps to explain why they were able to do better in the subsequent elections.