I also like to use the command line, but I hate that flags are inconsistent, case sensitive (with unrelated meaning) and not good discoverable
> flags are inconsistent
At least among the core command set, there is a set of "core flags" like -ErrorAction or -Verbose that are consistent. Though I don't know how often you'll find them in third-party commands.
> case sensitive
There's a preferred case that you'll get if you tab complete, but -Verbose is -VERBOSE is -VERBOSE.
> not good discoverable
Tab completion works for flags everywhere and each of them should be included in Get-Help regardless of if the author documents them.