There is a slight inconsistency on user messages when trying to log in to often. If you fail several times you both get a captcha implying you should type the captcha _and_ a message saying you can't log in. ("You have made too many recent login attempts. Please wait before trying again.")
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=46965