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Yes, it is absolutely unprofessional. I won't say it's never effective, but that's not what you asked. Professional design avoids those devices - for several good reasons, some mentioned in other ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/3011 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/3011 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Yes, it is absolutely unprofessional. I won't say it's never effective, but that's not what you asked. Professional design avoids those devices - for several good reasons, some mentioned in other answers, but give special attention to this one: **unprofessional** advertising overuses CAPS and exclamation marks to a ridiculous extent. Why let yourself be associated with that?