The agency reputation is first criteria. The pictures and services listed is second. TOFTT is not as meaningfull as it is now... i realize there is way less reviewer these days compared to when i started, at least the core of MERB is still present but there is less "ocasional john" that review and much more lurkers... But interestingly it seem the business is MUCH MUCH more competitive these days. When you look at it some agencies have developed a very core of followers, and have established excellent customer services. While other agencies like MTL sex city for exemple kept the same good customer service over the years and are as reliable these days as they they where back then.
Agencies of the old period have either died for some, or have been literaly fading away. I mean, look at Devilish/GOF, they where the top dogs when i started hobbying, lots and lots of reviews. Superstars in there agency as well with multiple pages review thread. These days you don't see much reviews anymore. YES i did said there is less reviewer than before, so of course its logic BUT some agencies still have there girls in page 1. Hell Asservissante wich i think don't even advertise on merb have the most girls right now on page 1 of outcall reviews lol. Thats because i supose(never used them personally) the agency kept a great reputation over the years.
I remember devilish/gof had a lot of soso reviews, girls behaving not the best, but also lots of late arrivals. I supose they still have enough business because they still exist, but are they in top 5 agencies these days, nop, not at all. Been a long time i used them, maybe they did improved over the years, but my experiences back then where "late arrivals" as well.
In any case, i wouldn't hesitate to TOFTT with some agencies, but with others i would be much more hesitant.