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These help articles explain the difference:
Generally Soft Bounces are temporary conditions and Marketo won't set the Invalid Email flag to "True" or suspend email from being sent for 24 hours.
Hard Bounces are more permanent condictions and Marketo may set the Invalid Email flag to "True". If the email is being blocked, (e.g. error message may be "Exceeded MaxAttempts - 550 5.2.0 Blocked), Marketo will not set the Invalid Email flag to "True", but will suspend email from being sent for 24 hours.
Elliott's got this one. To answer your specific questions:
1. the error "No Match Detected" likely means there is no such user, although that's usually an error "No Such User"
2. Bounced Filters Matched Body Message: this sounds like the receiving server is looking for spam words and your message matched it for some reason. Consider running your marketing emails through Spam Assassin or Litmus.com to see if you are over using words like "free", "offer", etc.
Also see my Guide to Email Reputation