>>1013
I've played the game from the beginning (grew up with it), and didn't really stopped until link summoning. All the extra deck mechanics are actually really good, except for link summoning.
Syncros are cool because they require careful planing, as you need to achieve the tuner and non-tuner requirements plus they have to equal the level. And I think anyone can appreciate a turn one quasar summon. Xyzs are really good, as they made consistent monster levels a necessity, and they're easy to put into any deck. Pendulum are ok, honestly their major flaw is not having many decent archetypes. The only unbalanced and unfun to play against pendulum deck was majespecter (made me leave the game for half a year, was very salty).
But links on the other hand ruined the game, as in order to summon more than 1 extra deck monster at a time, you need to use link monsters. Not to mention they make most non-meta xyzs useless, as they just need x number of monsters (no same or different level rules). I'll try the game again when April comes, as they said they were removing the whole link requirement for non-link monsters, in other words you can actually summon more than 1 non-link monster.
TL;DR all of them are good additions except links, which were a clear cash grab. Also, in April they'll remove the requirement to have links.