I was under the impression that Tomiki invented a style of aikido that people in the west could follow. In Japan, a person might spend the first sixth months practising just ukemi, and then go on to ikkyo for the next six etc. Because westerners are, in general, less patient, Tomiki created a system of kata that incorporate all these basics in a 'fun' way. I suppose competition is another way of making aikido more attractive to people...
Overall, I think people who study Tomiki-ryu end up being just as good aikidoka as those who studied other styles, it's just that they've taken a different path.