In my opinion USA-issued cards offering 25,000 or fewer miles (or equivalent points) are routine, and don't warrant much discussion. 50,000+ offers are special. This leaves a vague area in the 30's and 40's where my evaluation would depend on ease of combining with miles or points from other sources.
The reason I thot Amex was special was that it normally gives 10K and does not waive fees, so I thot it was a special. Plus the partnership with CO will be ending.