This is a bot, not a component.
As mentioned previously ‘automatic’ saves the time and hassle of manually adjusting every single page. If your Meta information and Title are not relevant to your content then the SEO is not entirely optimized, thus wouldn’t it seem obvious to have your most powerful relevant words associated with your content in ALL the places that count? After all, content is king, and JoomSEO reflects the content.

The title length is completely adjustable, google trims at 66 characters, Yahoo uses 120 as a limit, 80 is a nice average. I don’t see how 80 is too long and you can adjust it to your liking anyway.

You may like manual control; this is for people that like it automatically done for them so they can focus on other issues such as creating great content.

I would like to see proof that 5 major keywords based on the page content in the title is spam! Also the title tag is the single most important piece of information the search engines use when weighing your web page.

The generator tag also has no disadvantage to SEO and allows me to keep an idea of how many sites this free open source bot is utilized on. It is no different to the generator of most CMS and SEF products.

You are entitled to your opinion but this bot is entirely configurable to counter most of your points.

JoomSEF uses database to store its URL. This means that with wrong configuration or usage with unsupported components which generate far too many URLs, it is really possible that it can have influence to site performance. However, if configured correctly, this should not happen.