Can any case against a business be brought as a class action?

No. Just because you have a potential cause of action against a business does not mean your lawsuit can be brought as a class action. As explained in more detail in the description of a class action there are several legal requirements necessary to proceed in this type of procedural action. One of these criteria is that the questions of fact and issues of law must be common amongst all members, and these must outweigh any individual questions of fact.

Starr Austen & Miller will make a preliminary determination of whether all the legal criteria have been met for a case to be certified as a class action before a lawsuit is ever filed. Further, the court in which the case is filed makes a final determination of whether the case can proceed as a class action.

[Source: SFMSLaw.com]