Deividas here. The people searching for a Meta ads agency have usually been through at least one. They've either seen something go wrong firsthand, or they've scaled to the point where doing it in-house isn't the right answer anymore. What they need isn't a list of things to look for. They need to know what bad agencies say, so they can filter before they sign.
Most agencies lead with proof: ROAS screenshots, client logos, a case study deck. None of it is verifiable, and all of it is cherry-picked. The real signal is how they talk about your account specifically, before you've handed over anything.
A serious Meta ads agency asks about your unit economics before anything else. They want to know your blended MER, your LTV by cohort, and what your fulfillment margin does at higher volumes. If they skip this and jump straight to "we'll test 10 creatives in month one," that's a flag. You can ship a lot of creative and destroy a business if you're scaling toward a ROAS that doesn't actually cover costs.
Ask any agency you're considering: "How do you define success in month three?" If the answer is built entirely around in-platform ROAS, keep looking.
Facebook's native attribution has been unreliable since the iOS14 changes. In-platform ROAS routinely overstates performance by 20 to 40 percent compared to what a blended MER analysis shows. Agencies that report exclusively on native numbers are either unaware of this problem or counting on you being unaware. The ones who understand the job will report on MER, which is total revenue divided by total ad spend, and break out new customer ROAS separately from retargeting.
At Triple Scale, we target a new customer ROAS of 2x or better on Meta and a blended MER of 3 to 4x across the full marketing mix. Those are the numbers that show whether the business is actually growing. A strong in-platform number that falls apart under MER scrutiny is one of the more expensive illusions in performance marketing.
Meta advertising today is almost entirely a creative problem. Targeting has flattened. The algorithm finds buyers when the ad earns attention, and it doesn't when it doesn't. So when you're evaluating an agency, ask specifically about their creative operation: who produces the work, what does a brief look like, and what signals tell them to kill a concept early.
Vague answers here cost money. "We'll test different angles" is not a process. What you want to hear: how many concepts per brief, what hook variations they run, what their creative win rate is. Industry standard is that 5 to 10 percent of tested ads become genuinely scalable winners. If an agency can't tell you their win rate, they're not tracking it. That's not a small detail.
Hook rate is a related signal. The first three seconds of any ad determine whether it reaches enough people to matter. Across the accounts we manage at Triple Scale, a hook rate of 35 percent or higher is the threshold where creative starts to compound. Agencies that understand this will have opinions on it. Agencies that don't will look at you blankly.
Guaranteed ROAS targets before they've seen your data. ROAS is an output, not a commitment. Any agency quoting a specific number before understanding your funnel economics is guessing, and hoping you won't notice.
Long-term contracts framed as commitment. Six-month minimums exist to protect the agency's revenue, not your results. A good agency should be able to prove themselves in 60 to 90 days. If the contract runs longer than three months with no performance-based exit clause, you're absorbing risk they should be carrying.
Heavy reliance on one case study from one vertical. What worked for a $29 supplement does not translate to a $250 piece of furniture without serious adaptation. If every example they show you is from the same category, ask why.
Client retention. It's the one number an agency can't manufacture. If they're doing good work, clients stay. Triple Scale's retention rate is 87 percent across 50-plus brands. Before signing with anyone, ask what their average client tenure looks like. If they don't know, or deflect, that's an answer.
Speed of communication matters more than people admit. The sales process is when agencies are on their best behavior. A team that responds slowly before the contract is signed will not pick up the pace afterward. How they treat you as a prospect is the floor, not the ceiling.
You're not hiring an agency to run ads. You're hiring them to understand your economics, spend your budget with judgment, and tell you the truth when something isn't working. That's a much harder thing to evaluate than a screenshot of a 4x ROAS.
Ask about MER. Ask about creative process and win rates. Ask about client retention. Ask what success looks like in month three. If the answers are vague, that's what you're buying.
If you want to understand how well-run paid media accounts are actually structured, the Triple Scale media buying course covers the operating model end to end. For the metrics side, Meta Ads Reporting: How to Read Your Numbers breaks down how to separate real performance from platform noise. And if budget is part of what you're evaluating before committing to an agency, Facebook Ads Cost in 2026 covers what realistic spend looks like across placements and seasons.
