There's a reason it's the best selling aftermarket cooler on the market.
Let's be careful here....it a very good budget cooler, but that doesn't make it anywhere near the best cooler for the same reason that most sales doesn't make the Big Mac, the best hamburger that one can buy.
The Noctua NH-D15 will deliver 72C for example under the same conditions that the Hyper 212 Evo delivers 89C.
If ya have $30, it's a great choice; there are others. Which one ya pick won't make a helluva lotta difference. personally I preferred the $30 Scythe Mugen 2 but it's been replaced by the more expensive Mugen 4. The Hyper 212 used to own the $30 market niche but now there are numerous competitors several of which out perform the Hyper 212, two of them from relative newcomer Raijintek.
The Aidos is $20 and beats the 212 by 1C
The Silverstone Argon also edges out the Hyper 212 by 1C
The Themis is $23.50 and beat the 212 by 3C
results vary from test to test but 1-3C isn't going to make a lot of difference if for some reason you strongly prefer the aesthetics of another cooler.
Whether one made a mistake depends on what their goals are:
What cooler you use will depend upon what OC you wanna reach and how much voltage you need to apply to accomplish that:
Up to 1.200v = Very Good Air Cooler (Hyper 212)
Up to 1.250v = Best Air Coolers (Phanteks PH-TC14-PE, Silver Arrow or Noctua DH14) ....... Dual 140mm CLC / AIO Cooler w/ 1500 rpm fans (Corsair H110)
Up to 1.275v = Extreme Speed Dual Fan CLC / AIO w/ 2700 rpm fans (too noisy for most folks)
Up to 1.287v = Best air coolers (Cryorig R1 / Noctua DH-15)
Up to 1.300v = Swiftech AIOs ( Swifteh H220-X / H240-X)
Up to 1.325v = Custom Loop w/ 15C Delta T (3 x 120mm / 140mm) *
Up to 1.400 = Custom Loop w/ 10C Delta T (5 x 140mm or 6 x 120mm) *
* At this level having the GPU(s) also under water is assumed
Also, if you are not running AVX, you can add as much as 0.10 to all those voltages.