[Warning: Uncensored and not entirely though through response follows. I have not, nor do I plan to waste my time reading anything Gartner publishes.]
These are the same people that, every time an IIS vuln hits the wire, puts out a "report" that indicates that companies would be safer immediately switching to another platform, running another web server. Like someone who can't secure a Windows box can secure a Linux farm. And because the risk analysis required for an organization to switch platforms overnight is fast and/or easy. And because making knee-jerk technical decisions like this is a good idea. And so on...
Anyone foolish enough to read anything that Gartner releases and take it without a number of very large grains of salt should, by all means, stop using Snort and immediately purchase and deploy whatever product Gartner recommends by way of their little magic eight-ball/quadrant/revenue-box (which, for the bargain price of ~$250/hour, Gartner will kindly design and deploy for you--because they're nice people).
I see that Gartner Research are dismissing Snort as a "Niche Player" in their recent report "Magic Quadrant for Intrusion Detection Systems, 2H03". Has anybody else read this report?, and if so, what is your opinion? Regards