I believe this poll is too generic to be useful. All classes can contribute to normal groups well enough, and any group combination is stronger than a solo player. This is not taking into consideration player skill, or improper use of a class (such as a Rogue Tank).
Wizards are usually cited as poor grouping classes only because white damage is more efficient. Not all groups require high efficiency, and Wizards do get invited to groups. Wizards also have travel/evac spells, which is something to consider if you do not have a druid grouping with you.
I think this poll would be better if the idea was more focused, such as "what class combinations are strongest in a group?". A level 60 Shaman, Enchanter, Monk, Cleric combination is very strong across most content, and is stronger than a lot of other combinations. But that does not mean you are required to build this group composition to be successful in a lot of scenarios.
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