Assassination Classroom
good plot. nice enough character progress. quite predictable plot twists, but maybe not. not much romance, but damn it. There shouldn't be any romance in this.
Fairy Tail
great plot. nice character progress. too damn OP characters. nice plot twists.
Fairy Tail Zero
great explanation on how mavis formed fairytail but too lacking on the finer details. like with the war and how the Fairy spells were made, not to mention the Lumen Histoire. Then there's what happened to her co-founders besides getting married and "dying". Too many unanswered questions.
Apocalypse No Toride
good plot. unbelievable plot twists. too gore. so much psychology. infinitely better than HOTD in plot. no romance.
Katekyo Hitman Reborn!
far too rushed ending. plot had too much potential. could have continued how the former arcobaleno grew up. how tsuna met giotto. how tsuna chose reborn, not any of the girls. how he ruled the vongola. what happened with the varia, with byakuran and yuni, with checkerface, with bermuda and with the other arcobaleno. it had too much potential and they let it go to waste. damn it.
Naruto
great plot. could've been better, but meh. should have been yaoi since naruto is so focused with sasuke but I love hinata so okay. Sakura can go die however. awesome plot twists on the 4th great ninja war but it was too dragged out that it became somewhat boring before the end.
One Piece