The game was a mess, not even finished, but released, to reach the objective ($) of the publishers without thinking about what does the customer could think.
Main problem of the game was the frame rate.
In fall 2014 it's not possible to release a game that freeze every minute / is not fluid, the dream of the past generation of console was the 60fps and Ubisoft has realized a game that reached the maximum frame rate of 29 on PS4. That sucks.
Second problem is the quality of the graphic.
Softwarehouses should stop publishing videos of videogame showing high (and impossible to reach) graphics. Assassins Creed Unity showed on E3 was spectacular for the eyes. The version released is just.. mha.. good but not gold..
Third problem are the glitches.
This game is full of invisible walls, bad texture and dead people dancing doing the worm dance.
The news of today is that Ubisoft want to buy back the trust and the loyalty lost from their customer giving them a free DLC (and a free game for all the players who bought the season pass).
Is this offert really acceptable?
Should we trust more of this people that showed no respect for us releasing a beta of the game in change of REAL money?
