I'm glad this at least maybe will help you in some way towards being able to discern better. While this list is only limited to the stuff I've personally read, the scope of how much MTL has proliferated into fan translation scene is scarier and larger than you think (real human translators like me are now a very small niche in this community). And also, even though MTL itself offends my sensibilities as a obsessive language learner, it's kind of alarming how many people are falling into the trap of paying to read shoddy stuff like this (DON'T GET RIPPED OFF BY MTL!).

Like,it's one thing if you're a reader that only cares to read something and don't care if what you're reading is accurate or what the author intended to present or not... but I certainly do as a translator

@motokare personally, i don't mind mtl as long as it's not google and it actually makes sense haha. Figured a lot are using mtl because a bunch of "TL" groups popped and sometimes i check the raws. Back then it was so hard to find fantranslations due to limited ppl  and yes! I dont get where are they getting the audacity to ask money from readers when they're not even exerting an ounce of energy as a "translator" 

@myichiaa
I have to split my reply because it exceeded word length.

https://www.novelupdates.com/series/regrets-of-a-second-male-lead/

Is this the one? Luckily it's on Naver (because I don't use Kakao since I cannot purchase chapters as a foreigner).

Well, first off in the prologue:

RainofSnow:

“Is that so? It seems that father was mistaken. The Empire’s sword isn’t able to reach an ostrich, much less my leg*.”

[*E/N: he’s calling him short :P]

Source:

“그래? 아빠가 잘못 봤나 보다. 제국의 검이 타조한테 가까이 못 다가가고 내 다리에 매달릴 리가 없지.”

How it should at least be:

"Is that so? Dad must've been mistaken. An Imperial Sword would never cower near an ostrich or cling to my leg."

There wasn't anything to hint at someone being short... The dad was saying if Abel really wasn't scared, then why was he clinging to his legs rather than getting close to the ostrich.

Right after the first *** in the prologue, they missed a sentence. It wasn't translated, but that could just simply mean either they didn't check thoroughly or they don't know the source language and any MTL they uses didn't translate it so they didn't notice.

RainofSnow:

As the end of the social season approached, the whole family moved from the estate to the Capital due to the Marquis’ busy schedule.

Source:

가을 사교 시즌이 다가오면 바빠지는 남편 때문에 온 가족은 이맘때쯤 영지의 후작 성에서 수도의 후작저로 넘어오곤 했다.

How it should at least be:

As the autumn social season approached, burdening the husband with busyness, the family would typically relocate from their territory to the Marquis residence in the capital around this time.

This '다가오면' the conjugation of the verb '다가오다' and ~면 is "when/if" There wasn't anything in the source to indicate anything ending. It's such simple language structure with simple nouns and verb '가을(autumn) 사교(socialising) 시즌(season)이 다가오면(approaching)' even putting it into MTL churns out the correct translation, I cannot even comprehend now the RainofSnow version veers off so far away. I mean if you read the next sentence from RainofSnow, it doesn't even make sense. first they claim social season is ending, then the next, "there's still plenty of time until the social season". 

Having arrived earlier than usual this year, ample time remained before the social season commenced. The Marchioness resolved to oversee renovations throughout the residence during this period.

So, I got lazy, what's left at the bottom half of their 'translation' of the prologue is so freaking weird. The chapter prologue ended with "oh, the poor marquis" but the source actually goes, "오(oh), 불쌍한(the poor/pitiful) 후작(marquis) 부인 (wife) aka marchioness."

How desperate you are to read depends on yourself. If you decides to pay for MTL, well... Unfortunately i checked the "P-free" novel site, and this novel isn't posted there, yet. if not I'd suggest you just mtl it yourself since it might actually be better in a lot of parts (at least as far as i'm concerned comparing prologue and chapter 1 MTL to RainofSnow's edited mtl)

@motokare If we were to remove MTL Translated Novels from NU, roughly 80% would be gone. At least we don't purposefully upload unedited novels (unlike some, smh) without care and try our best to make it good. Well, it's still on you if that's something you can't accept though, but what you said still helps, so thanks!