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+best story yet, actually explores key themes and implications of the Pokemon universe with a villain who represents a genuine threat
+most varied locations since Hoenn, lending a real sense of adventure
+new type for metagame shakeup
+the stat-rebalance taboo finally broken means formerly useless pokemon may finally see the light of day
+our childhood dreams of Mewthree and Mist Stone Evos made canon
+Pokemon-Amie allows honest-to-god bonding with your team, something I've been begging for since forever
+EVs are transparent and easier to train
+IVs are much more manageable
+3D is gorgeous if horribly overdue
+weather nerfs thank god
+customizable trainer, finally
+well-implemented accessible online system
+game is hack-free with only legit Pokemon... for the moment
+overworld music is mostly excellent
+great Pokemon design, including the best looking starters since Hoenn
-rock bottom difficulty curve with lots of handholdy features (EXP share jesus christ)
-few new pokemon
-more grass nerfs and water buffs, as if they weren't already the worst and best types respectively
-lousy rivals
-battle music is mostly crummy
-no Secret Bases still, a missed opportunity with Streetpass (which is woefully underexploited)
-blatant favoritism among Mega distro- gen 1 starters and blaziken? charizard gets 2? really?
-using 3DS 3D causes insane amounts of lag and is only used in select areas. Capcom can pull this off but Gamefreak can't?
i'm sure there's more but that's off the toppa my head