Good puller isn't necessary at all if the group has good dps and/or CC. You don't need to split the pulls if the team can handle multiple mobs at a time, in which case you can have any class just run into the next room and aggro the next 3-4 mobs.
Necro is the same as ranger, does a bunch of roles mediocre, so if your group is otherwise bad I guess the necro gets to shine. I wouldn't say it affects the group the most, it just helps if the group is otherwise terrible.
A well played bard quickly elevates a group from average to awesome. It's the best.
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Brutillus 60 Dragon Hero Bracer Shadowknight - <Awakened>
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