I think there's potential for rich snippets to help drive click throughs and perhaps make the user more likely to convert for these products.
If your site is a credit card comparison site, it may be worth linking the review with a rel=author tag of the person who added commentary and analysis, as well as giving the user the key details, such as rates, benefits etc. I'm reminded of Martin Lewis of Money Saving Expert (moneysavingexpert.com) - I can imagine a credit card comparison and review from him being linked via rel=author to make his face appear in the SERPs. That would be an appropriate use that would drive click throughs - while also giving the link a bit of authority and gravitas, as Martin Lewis is respected in his field here in the UK.
If you have individual product pages for each credit card, containing rates and an analysis, you could implement the star-rating rich snippet. Look at this Google search and scroll to the Aviva result to see what I mean.
Those are a couple of ways I can see rich snippets being used. So long as they don't appear to be 'forced' or manipulative, I'd say use as many as you can, as they can dramatically increase click through rates. Hope this helps.