Not so fast with the online voting...

I watched the demo for the instant run off voting and I think that it is a great start to improving the voting process, but may have one huge flaw.

The process assumes that the electorate has perfect and complete knowledge of all the candidates. In order to rank their preferences with any kind of accuracy all of the voters need to know a lot about each candidate. Realistically, voters choose one candidate (or one political party) and ignore the rest. Assuming the entire voting population - which would be necessary if the instant runoff voting system is ever to be adopted nationally - would take the time to learn enough information about each of the candidates in every race is unrealistic!

Is this a fatal flaw in the instant run off voting system or is there a way to redeem it with moderate changes?