BlueFish is a free and open source text editor supporting a wide range of languages, multiple document interface, powerful search tools, in-line checking and auto-recovery, and other features.
BlueFish is a good basic HTML and text editor that is easy for all to use. If I need someone to grab a friendly editor, then BlueFish is the way to go. If you need an editor to fix a bunch of pages then this editor has a lot of functions that are not found it other editors. Stuff like HTML Tidy or functions that strip extra lines out.
I would recommend Vim in any scenario where text files have to be viewed, created, or edited on GNU/Linux computers. Regardless if you need to quickly change a few things in a configuration file, or you need to write up a full document, Vim is great. I wouldn't use Vim to view, edit, or create anything that requires "rich-text". In other words, if you need to format the text (bolding, font colours, word-art, etc), then Vim isn't the tool to use.
Easily found and downloaded. If I need someone to go to the web and grab it I can tell them the URL. It is easily installed and one can be edited in minutes.
BlueFish is easy to use. It can have a non-technical user use it to edit config files or text documents and not have them frustrated. It has a friendly straight forward user interface.
BlueFish does a really good job editing HTML documents specifically. Probably one of the best HTML editors left out there.
There are WYSIWYG Open alternatives, some of which work perfectly as an Open version of Dreamweaver, but the only suggestion I would have is that Bluefish add a WYSIWYG tab, e.g. code/visual.
I don't consider the steep learning curve to be a hinderance on the overall usability. I would rate this a ten, but to be honest a lot of people do get hung up at the beginning and just abandon it. However, for people who have made the moderate effort to get over the hump, nothing can be more usable.
As with most GNU GPL products support is top-notch. Documentation is fantastic, all functions are documented. Also, this product has been around for more than a decade so there is lots of stuff on how to do this or that with this tool. The only thing holding you back from support is your own drive to find a solution. RTFM, my friend.
There is no commercial support for Vim. Thus, it will not get a mark beyond 5. However, community support is very good. You can easily find solutions for most of the problems in the community.
Compare it to what I'd call its WYSIWYG editor, BlueGriffon. Again, the two are fundamentally different solutions. Use them together. Don't waste your money on Adobe or any other proprietary alternative.
Vim's keybindings are a lot more complex than Notepad++. With that, comes a whole bunch of capability that Notepad++ just can't match. Emacs is comparable, in terms of capabilities--because Vim is built into so many unix systems, I chose to learn it instead of Emacs. Knowing both probably isn't a bad idea, but there's enough to learn in either camp to keep you busy