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« on: May 20, 2014, 04:47:27 AM »
The summoners spell list, his summons, and his eidolon are all potential "campaign smashers" for an unprepared GM. There are several spells that can arguably "break the game" on this list, including many of the best battlefield control spells, teleport, etc. The summons are amazing, particularly when backed by the right feats. And they last a long, long time. The eidolon can have the highest AC in the party and do the most damage quite easily (though a well-optimized PC can do better, the eidolon has a very high optimization floor), and has access to permanent flight very early. Even when trying to downplay the summoner's advantages, my summoners have raised eyebrows and ire in my fairly high-op group just due to general competence.
This is not to say they outpower a heavily-optimized T2 PC, particularly in 3.5. A mailman build will probably smash them flat. But for your average group, even if they optimize well, the summoner will come across as very consistently having the answers to the problems the group has, and will have several tricks that few others can match, all at the same time.
I've seen a few people argue the Summoner is T1 or even T0, but those people have no idea what they are talking about. They just saw how powerful the summoner was in their game and overreacted. Still though, it points to how powerful they can be in your average party.