Not going to pretend to know anything about game development, but what bugged me (and many others over the years) is that they started over completely from scratch with each new series. Budokai to Budokai Tenkaichi made sense because it was completely different. BT3 to Raging Blast was a complete downgrade when they were trying to be the same game. I'm sure Spike had to recreate assets from scratch, and that's fine. To completely overhaul the engine and make it way worse? Not saying BT3 was amazing, but it was a damn good framework that didn't need much more to be an awesome game.
Doesn't really apply to Xenoverse since it's by a different team, but that's the way I've looked at BT3 vs the games that came after it by the same developer.
You seem to be missing alot of info with this thing that bugs you. No team that ever worked on successful dbz games ever started over completely until now.
Dimps made Budokai 1,2,3 etc & a few other platform games(Burstlimit on 360 /ps3, shin budokai's on the psp etc). None of dimps older games were completely remade or starting over. they all had the same budokai engine.
Spike made Tenkaichi 1,2, 3, raging blast 1 & 2 and a few other games.
Ultimate tenkaichi was also made by spike.
Spike never completely scrapped & started over with any of these games. They all have the same tenkaichi code at their core.
Battle of z was made by chunsoft. it was their first dbz game entirely.
Xenoverse was made by dimps. The main reason they started from scratch is the legacy tech they made for the old budokai games would take so much overhauling to turn into the game we got it just isnt worth the work. it was much more advantageous to just build everything anew to fit the vision they wanted with the online / created characters & more.
Stopped making me hyped for Xenoverse. I already have this preorder and am getting the Season Pass... just need the damn thing to release >.<
It is so fun! I have been playing it 6 days straight and I am no where near exhausted or bored. I havent even fought online or co op yet.. I have just been training my characters & trying to master the combat as best as possible as well as unlock more things.