I think most people are irritated by the Kyle & Yost slaughter spree on NEW X-MEN, not THE 198, which they didn't write (I believe).
Basically, a pair of other writers had relaunched NEW MUTANTS and it merged into ACADEMY X and so forth. It had a sprawling teen cast and was akin to "X-Men as Hogwarts" only with more teen soap and less action. It may have been akin to X-FORCE by the late 90's before Milligan got aboard and turned it into X-STATIX. It needed a kick in the rear to move things in the drama department up a notch.
Kyle and Yost got aboard and instead of a kick in the rear, they gave it an atomic bomb to the face. While M-Day gutted the book by depowering half the cast, Yost & Kyle's brilliant idea was to make the stakes higher by killing off supporting characters left and right, then mutilating the rest. What they failed to understand is that simply made it a horror show where you roll your eyes every time Jason Vorhees stabs a co-ed, or something. The term "overkill" is too subtle.
They have been capable of solid work on TV (X-MEN EVOLUTION, and FANTASTIC FOUR: WGH overall) and Yost has written some good mini's. But I may add they've hardly lit TV screens ablaze in DTV glory yet. Everyone is predicting HULK VS. will finally be a Marvel LG hit, and it only took 4-5 tries.
Honestly, I think they've written for TV so long that they seem unable to grasp anything greater because network censorship has been internalized. But, that's just me. Simply going for gore does not make a work above Saturday Morning fare.
Let's say Cyclops has been acting so off lately that nearly everyone presumed he was the X-Men's "token Skrull" during SECRET INVASION. That should have revealed something.