Personally, I prefer equality among routes, so I'm not a big fan of canon routes =)) especially when the canon LI gets blatant favoritism and a canon happily-ever-after. It makes it feel like all the other routes are just irrelevant side pieces sDdd
Also, since canon routes tend to dump all the heavy lore, world-building, and main conflict resolution on you, it easily becomes boring and draggy, or just lacks romance entirely.
Plus, it's often recommended to be played last since it provides the full closure and contains all the spoilers, which makes me feel like I don't have the freedom to choose, if that makes sense =))
*whispers* Though honestly, the canon guy is rarely my type, and that's probably the root cause of my hatred for everything else I just mentioned lol.