For what will you mainly use it?
Signal to noise 78db might not be the most quiet mics out there, but it is probably not any problem in most instances.
As read below, all signal to noise above 74db is good. Often tube mics tend to have not as high s/n ratio than those without, so 78db should work fine for most instances. Dynamic mics can tend to have higher s/n ratio as well and might need a good preamp to get best of use. But works really well for drums, guitar amps and other louder sources.
The more one need to push up the gain on the recording (if having a bit quieter sources, the internal hiss together with preamp hiss, might be too much. the higher signal to noise in both preamps and mics, the lower is the noise level and the more subtile sources can be recorded.
https://mynewmicrophone.com/what-is-a-g ... icrophone/
Other than that I can not judge if it is good for what you will record, if it fits your voice or the instruments you wish to record. Sometimes a frequency diagram comes with the specs and can tell a bit more of how it may fit ones own voice character, but even same mic model can sound slightly different from item to item, so one need to test it. But some things can be adjusted with EQ in the mix. It is more that if you find a mic that really suits your kind of singing voice, it matters not if some say they do not think it is good. Cheap mics can be perfect for a certain task.
I found a ADK 51 cond mic very cheap at a second hand shop a while ago, and I found it to fit my voice better than the Rode I had used too. They are different and good at different, but Rode has more higher frequency, which pick up more noise and siblience. It is very crystal in its pickup, so I found myself having to darken it in the mix. I had a want to get a dynamic mic or Ribbon mic that often rolls off at 15-16kHz. But I found that the ADK51 did pick up a bit similar to as if using a dynamic, capturing less of the whistle spectrum, at least not exaggregated in that field. And that saves me from a bit of work when comes to voices.
Instead I have to roll off a bit of the bass as it lacks a cutoff filter, but that I almost always do anyway when mixes. I rather boost a better balanced higher frequency spectrum than getting it over the top. And ADK51 is not considered a v"wow" mic but I found it to be relaxed and doing a good basic allround job. Especially when recording speach (radio etc), such mic is very handy as it softens the voice. But to another voice character, the RODE NT2A might bring wonders as they might just need that upper lift to bring their voice into best balance. So, testing mics is best way to know, and even if a mic might not work as well as one expected to ones singing, it might be incredible for another voice or some other instruments. So mics is not to be judged too much as good or bad per se.
And with mics as with headphones...the debate on how good they are can be endless.