EDIT: Concerning mythic rare, I really don't see what's so different about how it's being handled in this set compared to previous sets that had tournament quality cards there, like Zendikar and Dragon's Maze, so I don't see this as being a change in attitude. Besides, the most expensive cards of Theros block were at regular rare, weren't they? What I do think will be an issue is the inclusion of good cards in small sets as long as the draft format is (Small)-(Large)-(Large). Even if the format changed to S-S-L, there would still be far fewer small set boosters being opened than the large set, assuming one were to draft both formats equally as often, but it would help card availability a lot.
Dragon's Maze- half of the Mythics (Council of the Absolute, Dreadbridge Chant, Master of Cruelties, Progenitor Mimic and Reap Intellect) are Constructed unplayables, There is a Legendary Land and a Planeswalker (Obvious Mythics), A nice Timmy card (Savageborn Hydra), and a multicolored vampire with a lot of big numbers in it's textbox. Legion's Initiative ended up bulk as well, but people thought it might be good.
It's only Voice of Resurgance that stands out, and they admitted that they made a last minute change with that card and the G/W Mazerunner. Meanwhile at normal rare, there are lots of generically powerful cards that stand out as Standard staples-Advent of the Wurm, Aetherling, Blood Scriniver, ,Notion Theif, Render Silent, Renounce the Guilds, Skylasher, Sire of Insanity (even though some did not see any play).
Zendikar- there are only a few constructed playable mythics here- Iona (in eternal formats), Eldrazi Monument, Mindbreak Trap (eternal formats), and Warren Instigator (which amounted to nothing). The only real issue card is Lotus Cobra- which, if you remove the name from it, feels like an uncommon instead of a Mythic.
It just feels a lot worse this time around because it's more than just one outlier this time around.