In a word, yes. Like I said, if you want something below best, use it. If you want best results, don't.
For the record, I also dislike noxxic and icy veins guides because of how inaccurate they tend to be. I also tell people to not use simcraft for hard DPS numbers, but to use it for comparing between pieces for different types of fights, and for getting stat weights. I tell people if they want Arms help to go to Recky and not me because, while I can do decent with Arms in CMs, I haven't played it since the 5.2 changes and can't play it as well as he can.
I'm not an employee of any of these people, so I have no interest in saying "OMG BEST THING EVER." If they want me to stop telling people to not use their site, they either need to hire me to fix it for them, or fix it to the extent that I can tell people "this is a good tool."