A stupid comment plugin made for people can't remember so many mappings:)
You only need to remember one mapping for comment:
Use your favourite plugin manager add something like
Toggle comment of
count(default current line) lines.
Toggle comment of a block. Yes, it's a motion mapping,
ip could be any motion object.
Select a block and toggle comment
You can use
. to repeat your last comment command, no need vim-repeat.
If you have emmet-vim, the plugin would use emmet comment function for comment toggle of tags in html/xml/xhtml files