Thanks for sharing your Peer Evaluation Form - both the Word doc and the Gform. I thought your approach was very straightforward and, putting on my participant/learner hat, I'd be more inclined to complete the online form and maybe it doesn't have to be anonymous to make me inclined to be honest?
As Bettina mentioned, creating a supportive learning environment/community could help, as well as incorporating an ongoing, formative use of the tool?
A couple of minor suggestions/questions:
1. Move the meaning of the "1234" to the top of the table in the Word doc - sometimes students don't take the time to scan an entire document and might just guess.
2. Make clear when you want students to share their own perspective (expectation) or when there is a clear course standard and they should be assessing whether their peer had achieved that standard
Note: I noticed a couple of comments you've received have addressed the vague nature of expectations and assigning a point based on expectations. However, I'd suggest you NOT try to be more specific - the feature of single point rubrics that appeal to instructors and students (IMHO) is the simplicity and ease of completion.
If you clarify that this is the student's assessment, based on their understanding of course standards AND their own perception of what was "useful", "valuable", "tactful" etc. I'm not sure that such subjective terms can ever be totally clear without way too much detail? Perhaps the suggestion to add an Examples column could help? So the students could quickly provide an example of what they appreciated or found lacking?
And a final reflection in terms of how such a tool could be used. You say, in the Gform, that their responses are anonymous but, perhaps, just as important, would be to make a brief statement of the value of sharing peer perspectives and how the data will be used. If not in the form, then whenever you introduce its use?
You could introduce an appreciative perspective both explicitly and by modeling how you yourself provide feedback/assessment information to the group?
In terms of your exploring the use of an anonymous tool - it would be helpful to think about the size of your cohort, and how valuable their feedback or how fair their assessment might be if the teacher is going to use it to create marks? My concern with peer feedback, particularly in larger groups would be that it would have to be considered in light of the participation level and attitude of the person providing the feedback. I've seen students provide fairly quick responses to peer feedback and, when I checked my notes (and the online course records) they sometimes had spent very little time participating themselves.
If the purpose of the peer feedback was to identify potential areas that could be improved rather than helping an instructor render an evaluation, I believe your rubric would be very useful.
Cheers