well, it could be that your 'friend' is just an ass....
yes, the new terminal is a bit sterile, but I would submit that the soaring ceilings, vast expanses of glass, and extremely well thought out technical aspects put it among the forefront of world airports.
I have also done a bit of travelling, having averaged 3 trips per month over a ten year period, and I can tell you, the only airport which really impressed me more was Singapore.
Pearson ain't perfect, but it is a world of difference today compared to the ramshackle mess it was previously.
furthermore, there is no imperative for architecture to say that you have arrived in "toronto", just because it is an airport...most of the world's major airports are pretty generic. I would take Pearson any day over the kitsch that you would find at, say, Vancouver...