Depends Breez, there a certain fights like Garr or golemagg in this gear range that are going to require multiple tanks and then the appropriate healers. I would say a solid core of 25 at release with the right classes could carry MC, and then fill it up with warm bodies. The server has over a thousand accounts already, you'll have no problem filling up once the flood of casuals hits 60.
The vanilla you see on other private servers is by no means difficult, you get access to gear thats months ahead on the time line + 1.12 talents + broken coefficients and boss mechanics or debuff limit.
Even if some of the values for spells are messed up on Nostalrius, having an 8 debuff limit and the old 1.04 item values will make it leagues harder than any of the crap Feenix or even Scriptcraft put out.
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