hmm, where to begin?
linebarrels of iron (the mecha designs are nice but thats about the only bit of praise one can give it)
valkyria chronicles (the sudden shift in the second half from light hearted to pure angst was just rediculous, then there's the love triangle they tried to shoehorn in for no reason, the other shoehorned in romance between rosie and zaka, the changing of a couple of events from the game just to show off selvarias powers, random unresolved anime only subplot involving some research lab, selvaria and alicia, alicia being changed from a likeable character to a standardised tsundere, the lack of named darcsens outside of isara and zaka)
gundam 00 S2 (took the premise of season 1 and shat all over it by dumbing things down to the same basic good vs evil moral platitudes in seed destiny, lyle dylandy, severe lack of hal, MARIE! MARIE! MARIE!, grahams character derailment (seriously, mr bushido?) and ali being reduced to a benchwarmer, that rediculous nonsense about GN pixie dust leading to developing a sixth sense, oh and the real big bad being revealed to be a green haired bond villain esque pretty boy)
gundam seed destiny (enough said)