It's possible to target competitors beyond the basic competitor campaign (which is where we show an ad after someone searches for a competitor). We can do this using affinity & intent audiences (which are audiences of people who are frequently associated with the competitor's business).
A good remarketing strategy...
E-commerce Campaigns but built as Lead Generation.
Cart Abandonment Campaigns & Cart Abandonment Audiences:
Yes. But we currently don't recommend adding product ratings to ads.
If you've ever wondered why Google Ads doesn't show the same conversion as Google Analytics, read this.