Both sides have haters and uh.. lovers, of lack of a better word. Having trained different styles over the years, I've concluded that grown men don't shit-talk other systems. (at least they should be mature enough that they don't do that, but I guess it has to do with money and prestige)
A healthy debate over what is applicable to different scenarios is another matter completely, but as I get older I can't even begin to say how ridiculous it is when someone openly talks down another system, especially in class.. A system suits an individual based on that individuals personal needs.
I've heard the argument often that says 10 planet isn't at the top in the competition circuit. It's a young system, and what I've seen is that there's a lot of highly competent competitors in this system, However, personally, I couldn't care less. It's it's own animal, it has it's own flavour, it's applicable to MMA, it's no-gi, and it suits ME. People talking shit about it pisses me off.