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60% of MD5 password hashes are crackable in under an hour
(www.theregister.com)
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If you can generate an input which satisfies an md5 comparison which results in being able to authenticate with a system, then I think debating if that is a "crack" or not is purely semantic.
Although you are for sure technically right, I think any actually observed md5 collisions are with very large inputs, many orders of magnitudes longer than a password. The smallest input (first found, almost certainly) is almost certainly what the original password was.