Learn English – someone who makes a testimonial called

I was able to find a few instances of computer and car products being described as brutal:

one here:

Asrock 970 Pro3 promises brutal performance with 8-core AMD CPUs.

and another here:

The Mazda 6 MPS is a more refined, larger car that offers more space and luxury together with the brutal performance of it's [sic] turbocharged engine.

I'll point out that I had to wade through some irrelevant content (much of it using brutal with a negative connotation) in order to find these. You will also notice that these examples are not from major marketing campaigns. I also searched YouTube for "brutal performance" and got lots of hits for loud cars (most of the results were for rock music videos).

The intended meaning of brutal in these instances is probably some combination of strong and rugged, or perhaps even manly or interested more in power than the feelings of others. How it is actually interpreted will vary from person to person, but some people will probably receive a negative feeling from the word (I am reminded of a list of adjectives in Hobbes' Leviathan, "solitary, poor, nasty, brutish, and short").

As for whether it is okay to use the word in marketing, that all depends on the image that you want to put forward. Sometimes a company is okay with being seen as focused on raw power rather than on other positive attributes (perhaps to attract customers who think, "I don't care if my engine is quiet, as long as it's fast!") In that case, I would say brutal is just fine to use.

Other words (possibly with different connotations) that might appear in similar marketing outlets are:

• savage
• beastly
• unrestrained
• rugged
• powerful

You can say decision-maker. Whilst this might look like 2 words, it's a single term, and because of the hyphenation, it's practically one word.

If you don't need it to be one word, you could reword the second bit to "she calls the shots".