I thought it was well done and I'm looking forward to reading MaddAddam but it's not going to kick The Orenda out of first place as far as I'm concerned. So for me the list would be rated as follows:
1. The Orenda
2. Half-Blood Blues
3. The Year of the Flood
5. Cockroach (even though I haven't read it since I don't intend to).
The other 4 are all excellently written but I think The Orenda is the one that every Canadian should read.