After 4.2 hits you should be able to successfully PUG players through 10/12 normal mode bosses, considering the drastic drop in HP/damage output for every boss as well as the trivialization of several key mechanics. You probably can't drag players in greens through this content, but gearing a 10-man for Firelands probably won't be much of a problem.
The only real challenge will be the sudden spike in difficulty when transitioning to Firelands bosses at their full, shitty/buggy mechanic strength.
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