Sigoroth is actually right about the personal experience thing: you might find yourself convinced that a ship is good or bad because you see it performing well or poorly on the table, but that's not good methodology. It shouldn't be convincing to you, and you really shouldn't expect it to be convincing to anyone else. Simply saying, "in my experience, Murders perform better than Carnages," doesn't contain nearly enough data to be useful to anyone, and while you might (might) have gathered enough data from the actual games in which those occurred for that observation to be useful to you, it isn't useful to us unless you actually present all that contextual data along with it, or we have an established faith in your observational ability (which, at this point, we have pretty good reason not to). Expecting anyone who doesn't know you personally (and, likely, anyone who does) to take that sort of anecdote as worthwhile evidence is obviously foolish.
Also, I basically agree that the Murder is rubbish. Lance murder seems to be somewhat less rubbish than regular Murder, but still, if you're going to suggest a staple Chaos cruiser, the Carnage should be your go-to ship--not the Murder--and for good reason. It's more powerful and less conflicted.