Is eating uncooked spaghetti dangerous?
Yes and no;  in smaller quantities; no problem.  If you sit down in the morning and eat bowl daily; you will cause some serious long term issues.  


Raw flour is full of lectins and phytates; which can pose a danger in higher amounts; damage the lower GI and cause IBS; other issues
Nutrient problems can develop from the raw flour intake at higher amounts
Bacteria standpoint; no problem; eat away.


As the comment mentioned; some fresh pasta could be harmful because of the raw egg.