This is my only 1 star review of a Paizo product. So I feel the need to explain why.

Mythic Adventures is a based on a great idea. Instead of restricting epic play to (say) characters after level 20, create a mythic system that runs orthogonal to standard level advancement, and which allows players to do things and explore themes not allowed by the standard ruleset.

In the abstract, here are the kinds of things one would want such a product to do:

--1. Provide new mythic abilities which provide plot hooks, inspire the imagination, and suggest ideas for various campaigns or adventures.

--2. Provide new mythic abilities which allow players to do qualitatively different kinds of things than the standard ruleset allows.

Now, D&D 3.5 and Pathfinder have a number of problems when it comes to high-level play: everything takes too long to resolve, and the combat starts turning into rocket-tag -- whoever goes first wins. In part this is because the core game offers more means of boosting offense than defense, and in part this is because the D&D 3.5 math doesn't extend well to high level play. Given this, here are the kinds of things one would hope such a product would avoid:

--3. Avoid positing many more mythic abilities that boost offense than defense.

--4. Avoid new abilities which just add static bonuses to everything. (Increasing everyone's BAB and AC by 10 doesn't make your game more mythic -- it just leaves you with the same game but different numbers.)

--5. Avoid positing abilities which do little other than boost the numbers into the high-level regime where the D&D 3.5 and Pathfinder math breaks down.

--6. Avoid adding abilities which add new sui generis ways of making the game rocket-tag like, by adding yet more "I win"-types of abilities (either by themselves, or in combination with other Pathfinder material that's been published elsewhere).

Unfortunately, for the most part, the mythic ruleset doesn't satisfy these desiderata. Most mythic abilities and spells offer what are effectively bland numerical boosts. There are many more ways to boost offense than defense. There are a handful of abilities inspire plot hooks and feel epic (mythic Levitate and mythic Sleep, for example), but they're surprisingly few in number -- the spells in Ultimate Intrigue offer more interesting plot hooks and adventure ideas than can be found in this entire book. And the mythic rules introduce a huge number of ways to break the game, especially when considered in combination with abilities offered in other books: attacks that do over a 1000 points of damage, spells that ignore SR, give no save, and could kill any creature published in the Bestiary, and so on. (The 3rd party product Mythic Solutions offers some helpful suggestions for how to tone down the mythic rules a bit, but in my experience, most of the game-breaking abilities and combos we ran into are left intact.)

It's not all bad. As I mentioned, there are a handful of mythic spells that feel epic and are plot-hook inspiring, and the book offers some tools for DMs to use to make opponents more deadly. But on the whole, most of what's in this book is best avoided.