You walked into the team. They were already there. They came up under the previous manager, fit her style, hit her bar — and now you're looking at them thinking: I wouldn't have hired this person.
It's an uncomfortable thought because it sits there. You can't unthink it. Every meeting, every review cycle, every piece of work — you're filtering everything through "this isn't who I'd have picked." And eventually you start quietly building the case to manage them out.
Slow down. The instinct is almost always wrong, and not for the reason you'd guess.
Here's what's actually happening. You're not evaluating their performance — you're evaluating them against a counterfactual: the person you would have hired instead. That comparison is invisible, untested, and almost certainly inflated. Decades of research on hiring decisions, going back to Schmidt and Hunter's foundational meta-analysis, shows that managers' gut-level "would I hire this person" judgment correlates with actual job performance at around 0.2 — barely above chance. Your sense that you'd have made a better pick is real. The pick itself is much less reliable than your confidence in it.
The other thing happening is style transfer. Your predecessor managed them differently — different cadence, different feedback, different priorities. The version of this person you're seeing was shaped by that. They may be operating at 60% of their ceiling because nobody's run them the way you would. You're judging an output that hasn't yet been re-managed.
So here's what to do.
Give it 90 days before any verdict. Not "be open-minded" — actively suspend the judgment. Write down on day one what specifically makes you think this person isn't a fit, then put it in a drawer. Most of those bullets will look different at day 90, either confirmed by evidence or revealed as pattern-matching to someone you fired three years ago.
Separate skill gaps from style mismatch. This is the most useful diagnostic you can run. Ask yourself: if this person delivered everything I'm asking for but did it in a way I'd never do — would I still want to manage them out? If yes, the issue is style and that's a you problem, not a them problem. If no, you have a real performance question, and it's solvable through normal feedback. Most "I wouldn't have hired them" instincts collapse into style mismatch under this question.
Reset the contract explicitly. They know they didn't pick you either. They're sitting there wondering what the new bar is, what the new priorities are, and whether their old wins still count. Tell them. Have a 1:1 in the first month where you say plainly: here's what I need from this role, here's how I'll evaluate it, here's what's changing from how things ran before. Don't make them guess. A lot of inherited-employee underperformance in the first six months is people still working to a contract that no longer exists.
Set the bar based on the role, not your hiring profile. The question isn't "would I hire this person." It's "is this person able to perform the role I now need them to perform." Those are different questions. The first is about your taste. The second is about their output. Stay with the second one.
The reality check: sometimes the answer really is no. Sometimes you inherit someone who genuinely shouldn't be in the role, and after 90 days of clean evaluation it's clear. That happens. But the cost of managing out an inherited employee — backfill, ramp time, lost institutional knowledge, and the signal you send to the rest of the team about how new managers treat existing people — is almost always higher than the cost of giving them a real chance under your management. Managers consistently underestimate the first cost and overestimate their ability to find someone better.
Bottom line: your "I wouldn't have hired them" instinct is mostly noise from your own hiring preferences leaking into a performance evaluation. Run them like you'd run anyone else for 90 days. The verdict you arrive at then will be worth something. The one you arrived at on day one isn't.