Perhaps some other areas, aside from movies and restaurants, where wisdom-of-the-experts would be reliable guides include:

• Hotel reviews (quality can be subjective, but experts know the factors to consider, can identify telltale signs of problems, and have seen enough variety to judge). Few things are more annoying than 1-star reviews on Hotels.com or TripAdvisor where it’s clearly an overly-picky person with a sui-generis situation that shouldn’t reflect badly on the hotel overall.
• Furniture. Amateur reviewers might comment on style and other matters of taste, but professionals will know about nuances of construction or design to tell the difference between quality and otherwise.
• Professional services, e.g. lawyers, accountants, psychologists, tax preparers. I’d love to see professionals’ anonymized thoughts on fellow members of their profession, because I’m not qualified to judge subtle differences in expertise or skill, I’m not going to hire one frequently enough to have a basis for comparison, and sites like ZocDoc are really just aggregations of subjective, one-off experiences and mostly reflect bedside manner, not skill.
• Cars (style and taste can’t be accounted for, but within categories, differences can be massive). There are so many review sites it’s hard to know what to trust, and since my purchases will be one-offs (rather than recurring), and large (so I want to get good value), I’d much rather see some aggregate opinions.
• Charities and nonprofits. There is so much misinformation out there on the efficacy of different organizations, their overhead and success metrics, it’s hard to know how far your money is going. Some people give for emotional reasons or to places with personal or local ties, but whether that’s your intent, or solving big global problems, some meta-advice would be helpful. And no, United Way ain’t it.

Basically, any category where the following applies would be a good candidate for this:

1. It’s not a “search good”, i.e. you can’t properly evaluate the quality before buying the product or service
2. Amateurs’ opinions will be hopelessly colored by extraneous details or situations that aren’t of general applicability
3. There are enough objective factors to evaluate, if properly informed, that experts will be able to speak intelligently to them (i.e., exclude hopelessly-subjective things like music)
4. Purchases of the good or service are occasional, non-trivial in price, and usually non-serial (i.e., I can probably judge my dry cleaner or hardware store fairly, based on going there every month).

Thoughts?