By owning the "standard" and developing it in secret, without participation from other vendors, in an Ecma rubber-stamp process, Microsoft rigs the system so they can author an ISO standard with which they are effortlessly compatible, while at the same time ensuring that their products maintain an insurmountable head start in implementing these same standards. There is no balance of interests in OOXML. It is entirely dictated by Microsoft, and voted on, in many cases, by their handpicked committees in Ecma and ISO.
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Remember, standards bring interoperability, the ability to try out new tools and techniques, the ability to migrate, the ability to chose among alternatives, the ability even to run non-Microsoft products. If standards are meaningless and ineffective, then the incumbent' vendor lock-in will win every time. At that point, isn't it convenient for them to have a monopoly in operating systems and productivity applications? This, in my opinion, is the essence of Novell's 2004 complaint, Opera's present complaint, and the ongoing file format debate. Microsoft's monopoly power and the resulting network effects have lead to a relationship with standards where they win by winning, by drawing, or even by cheating so much that they discredit the system.