Target saturation is the way I play, lots of movement and lots of targets. With the Mutilath, it's Spell Target saturation. Yeah, they may dispel one bound spell. Hell, someone may burn a Scroll on it. That's a Scroll that isn't being used on my Nurgle/Death magic from my Daemon Prince(s). If they really want to dispel the Mutilath and leave themselves open for something more dangerous.
I'm not convinced about the Mutilath yet, same with the Warshrine. But I'm intrigued, I'm definitely curious enough to give them a whirl. Meanwhile I've got a horde of Trolls I'll be working on. If the Mutilaths don't pan out I'll probably go Hellcannons or Shaggoths.
As for the rest, Marauders definitely needed to be toned down. My initial reaction though is that they may have been a little heavy handed with the points on our core in general. Marauder Hordes just aren't likely to happen now, but I see some possibilities for say Marauder Bunkers for Sorcerers for example. The biggest problem really is the PPM for Marks, 2 points each for most marks makes the prospect of a Horde formation daunting at best.
On units like Warriors though, it's not as big of a deal unless you typically run 20+ units. I ran some numbers last night and made a spreadsheet of some typical units I like to run to compare points VS old book and for example a 15 man unit of Warriors of Tzeentch with Halberds and Shields saw an increase of 25 points, that's almost a unit of Warhounds.
I'm not going to say it's criminally over priced or anything, but it does feel a little heavy handed. Our Core is just a bit more "elite" in terms of points cost, unfortunately we didn't really gain anything for that point raise.
It's going to be interesting to see how lists develop over the next few months, I'm definitely going to focus on a Monstrous Horde style list initially, but after that I think I'll revisit my MSU style list and see what it will look like now.
My biggest complaint with this release is the cost, seriously $80 for the new monsters? $60 for Throgg? $50 for 10 Forsaken! I'll end up in a support group at these prices, telling some story about how I did abominable things for little plastic men.