I've had the complete opposite experience with my tablet. I don't know what kind of ungodly accent you have, but I've never had a single issue with it knowing what I'm saying even in noisy rooms.
To me, Siri is a gimmick that you can ask "Hey Siri, where can I bury a body LOLOLOLOOL" and for simple tasks, Google Now is actually useful in showing you what you want to know, showing you relevant info without asking etc. all on one screen. Not to mention it's a hell of a lot faster finding information, and I've tested it side by side with my brother in law's iPhone 5 and I get results in about a second instead of 3-4 seconds of waiting for Siri to do whatever the **** it does.
That pretty much sums up what I use Google Now for and why I like it a lot more than the cutesy little Siri.