The main issue was that the previous version of Summoner was so complex that it was completely unapproachable to a good number of players, myself included.

New SMN may be simple but everyone can understand and play it, and I think that was the goal.

Personally, I think it's fun and interesting but I can see why people are upset.

Hopefully they build upon this new foundation and it regains some of the complexity it had before eventually.