Gamer's Nexus have their 11400 review out:
Intel's new i5-11400 CPU is one of the best-positioned potential rivals to AMD's long-standing $200 dominance -- except this time, AMD doesn't have anything ...
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As a gaming CPU it's comfortably taken the crown of "bang for buck" from the 3600 now that AMD have completely vacated the sub $300 price range.
Trades blows with the 10600K (sometimes faster sometimes slower) and comfortably beats both the 3600 and 3700x across the board. They recommended it as a gaming CPU based on pricing of the 11400 SKU but depending on your market you might be able to save a decent chunk by going with the 11400F which ditches the integrated graphics making it a like for like comparison.
It's a little behind in production workloads and this appears to be due to the strict power limits in place by default, limiting the boosting frequency. No benchmarks to back it up but based on the 11600k results, removing those limits may claw back most of that deficit.
I really think this should be replacing the 3600 on any and every "budget/ bang for buck" build guide. The 3600 really can't be justified as a selection in any gaming build anymore, it's simply slower and more expensive.
With memory overclocking and PCIe 4.0 on B560 boards now, there's really no drawback with going Intel in this price range anymore.
The 3600 had a good run, but it's time as a gaming CPU recommendation is well and truly over. If anyone continues to recommend it for a gaming build, then you're best served ignoring their build guides completely.