That this topic is pretty cleanly split along partisan and rural/urban lines indicates that most are likely approaching it from a partisan perspective, rather than considering it on it's merits alone.
Faster and easier commuting between the largest cities in the country is a good thing. Even I, raised more rural than most*, can see why HSR makes sense.
HSR, alongside LRT, busses, etc., is far more efficient than yet another road leading to the same 5-10 choke points. How many more lanes leading into the 174/417 interchange, 417/Carling interchange, or 417/416 interchange does Ottawa need?
Sometimes the right solution is the mix of two solutions.
@Brad Sallows' more busses, and
@ytz's more rail. They aren't mutually exclusive, and since busses are a municipla/provincial issue, the Feds putting money into interprovincial/intermunicipal transit makes sense.
* I grew up a mile outside of a hamlet of 300... The closest "town" had less than 3000.