The most interesting aspect of this book is that Che looked at things just as any other commoner like you or me would have done. At the time of writing these notes he wasn't a revolutionary. The things he wrote about the Peruvian Couple and the labourers in the Mines of Chile depict how much he empathised with them. And then he went onto to help them. That's were the person in Che is much different from others who travel around the world for records,spreading messages and even self satisfaction.
Motorcycle Diaries is one great book that no one, who has a reading habit, should ever miss.
This whole day I was completely immersed in Che and I was searching for his other books, his quotes, writings about him. Among those I found this interesting paper by V Hari Saravanan. Have a read.