Might and Magic, specially the Heroes subbrand. Played the Heroes games obsesibely, my nick comes from playing them, and even was parte of the spanish community that decides unit translation and other things un the Homm V beta, but the change in Lore and tone after the Ubisoft buyout just lost me. Heroes V, expansions and Dark Messiah were decent, but what came after not, stories always revolving about demon invasion in some way, town being centered more in races like elves, Dark elves or dwarfs instead of the multirracial or multicriature nature of previous versions, VI and VII being kind of just Ok. It begining a little more generic fantasy setting stylewise and graphicaly (old setting was Also a little generic but has shit like realizing you are in a world where technology has fallen, or shit like armagedon Blade clashing with another sword destroying the world, or old iconic characters that they tried to being black to new Lore like Sandro).
Also Ubisoft appointing different brand managers over time, general lack of funding, sourcing it to external developers and fucking with them (they just basically killef Black Hole Entertainment)
But the final nail has been Ubisoft handling of It using it as its generic mobile and web spinoff IP. More than a couple of web browser games, mobile RPG, card Game... At least we got the great Clash of heroes out of this.
In resume, just the change from being the Main IP from New World Computing to the WTF do I do with this IP from Ubisoft.