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"Probation" is not a term which has any legal meaning in private sector employment law. This is to say passing "probation" does not provide any guarantee of continued employment. Unfortunately, the rule in Oregon is that employment is "at will" absent an express agreement to the contrary. At will employment can be terminated for any reason not amounting to discrimination on the basis of a legally protected trait (race, religion, gender, etc.) or retaliation for engaging in certain forms of legally protected conduct (filing a wage claim, taking FMLA leave, etc.). It doesn't matter whether the basis for termination is fair, reasonable or whether the employee has passed their probationary period.
So, if the reason you were terminated was because of low net rep scores, that would not violate any law, and your only option is to attempt to reason with your employer to get them to reconsider their decision. That failing, an individual in your circumstance should definitely be eligible for unemployment benefits, which should help tie you over until you find a new job.
I hope that you find this information helpful and am genuinely sorry if it is not what you were hoping to hear. Please do not hesitate to let me know if you have any questions or concerns regarding the above and I will be more than happy to assist you further.
If you do not require any further assistance, please be so kind as to provide a positive rating of my service so that I may receive credit for assisting you. Very best wishes moving forward.