Our team has overridden about a dozen rules (we bumped up line length and class length), but I find most of the default rules are fine.
Out of curiosity, what rules are unreasonable to you?
Sometimes it's really nice to fit three panes of code on a single laptop screen. Long lines can also indicate a code smell. It's ironic that one of the first things most teams change is the 80 character line length.
Classic example is Perl style %w(literal arrays) vs ['traditional', 'arrays'].
> Prefer `%w` to the literal array syntax when you need an array of strings
Which was introduced[1] into the style guide nearly 9 years ago with practically no reasoning. Prefer `%w` because why exactly?
[1] https://github.com/rubocop-hq/ruby-style-guide/commit/b27eff...