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It's no possible to completely say this is useless, which I will come to.

The main aim of UEFI and so on is not to provide security, the aim is to support DRM. Essentially, by ensuring that the computer only does what Microsoft wants it to do from the very bottom up, they will be able to secure the computer against it's "owner" (differently put, Microsoft will be able to own what you think is your computer). Everything else; securing the user; even blocking Linux; is just useful side effects.

When it comes to security, this really, actually is a valuable thing. There has been a whole class of anti-virus avoiding "root kits" recently, such as the one from Sony. These worked by being under the operating system where the anti-virus couldn't see and gave long term control of your computer to someone other than yourself and other than Microsoft. Some of these people were even nastier than MS themselves. MS doesn't want other people in control of your computer and UEFI will make life much more difficult for root kits.

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