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It was so disappointing how useless summons were in FFXII. Their boss fights were awesome, their summoning sequences were awesome, and it felt like the game wanted us to rely on them somewhat. Unfortunately summoning usually meant instant death, as all attacks are now aimed right at the summoner, and the summon barely puts a dent in anything :|
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My personal opinion is that Final Fantasy X did the best job with the Summoner job class and making its role in gameplay and story important. Like Jessweeee♪ said, I thought that Final Fantasy XII did a very poor job at this by giving its espers strange gameplay mechanics and little use in a standard playthrough of the game. Could you imagine how different of a game it would be if the importance of the espers was played up?