What's do you consider the lowest MDL Rating that is considered good for a drama?

So I have seen a lot of good and decent dramas and shows with 7.0 or 7.5 ratings and that's typically the lowest ratings I will consider watching because knowing reviews and ratings in MDL are generally low. I even see some shows with 6.0 or lower just because it was not on a streaming platform they preferred or they don't like someone from the cast and I consider them decent shows.

Generally, I consider a 7.0 or 7.5 rating to be above average and is worth giving a try.

I've mostly given up on MDL ratings. For a while I paid more attention to reviews and comments but even those have led me badly astray. Three of my favourites have pages of bad reviews because I don't know, it's like the writers and directors expected more attention and intelligence from the audience than the majority of western viewers are willing to give. 

 The exceptions are some hidden gems with few viewers because those who seek them out are generally going to give them enough attention to understand them.

For me, it's been a long road of learning who I can trust to make or recommend quality, whether it's directors, production companies or fans, and what I'm best off avoiding.

The lowest for me is 6.9 and highest 9.0.  In most cases I didn't like those ranked > 9, so I usually avoid tham as well as those below 7. But there can be exceptions.

MDL rating is pretty irrelevant but its a good indicator of what is generally liked,for example i have something rated 10 and im the only  one who has watched it in the site,another 10 i have has 6.2 rating with with 3.200 users rating it.
Meanwhile i have rated 7.5 (maybe worth even 7 tbh) a show that is rated 9.1 and have dropped numerous drama above 8.5+ rating.Now to answer your question if i hadnt watched the many shows i have watched i would probably look for shows above 7.8 in MDL rating,but at this point i pay no attention to the ratings.
Also agree with what someone pointed above,Jdrama are criminally underrated

Forgive me if I'm wrong, but judging from you watchlist I assume you are new to Asian dramas. In that case just go with the trendy ones with high ratings that have plots that intrigued you. See and develop you taste from there. At this early stage you have the freedom to explore.

For seasoned watchers we rarely rely on ratings anymore as we know what we're looking for. In my case I would watch for the writers, original source materials, and of course interesting plot in the genres I like.  I would also read negative reviews/comments and see if their points would matter to my watching decision or not. 

It depends on the content and the country for me. Some shows get a higher rating just for have having good cinematography even if the acting and scriptwriting is crap. For kdramas, the baseline for something that is good is usually an 8 for mainstream dramas. Anything lower and I know they're breaking the formula in a way that most people don't appreciate and might be in bad taste. Though for me personally, a 9 or higher might make my eyes roll as they sometimes tend to use formulas made to wrench the heart that I'm just not too interested in. But their indie stuff 7.4 - 9.0 is worth risking a look at. Doesn't gaurentee anything good though haha. 

For jdramas 7.4 is also my baseline of usually worth looking at. 8 or higher typically guarentees either something really well made or something that is formulaicly good (not necessarily to my taste.) In this rating range (8+), it matter more what the content is about and what my peers think of it. For jdramas, I luckily follow people whose opinions are usually worth listening to. 

For xianxia/wuxia cdramas though, 7.4-8.4 is riskier. There's less of a chance that something was rated lower just because it had a unique storyline that didn't vibe with people, and more because it was just poorly made or got draggy. Though sometimes that doesn't matter to me. I'll usually risk watching a 6.0-7.9 rated cdrama if its a miniseries. They tend to be fun and off-beat in ways that are forgiveable compared to like a 40 episode series with the same rating. Cdrama ratings are mostly useless for 40+ episode dramas though because so many of them are just rated high based on whatever actor inspired the cult following behind that rating. But, if a 40+ episode cdrama is 5 years old and still rated a 9.0, that means more to me than an airing show with the same rating. 

There are also certain tags I'm more invested in. For example, there are tags that if I find a drama is rated low (like 6.8-7.5) AND it has controversial comments? There's a chance I'm going to enjoy myself. And that's regardless of the country that produced it. 

For me, its more important to understand how audiences in various niches rate things and what that implies instead of just going off a number. Because these numbers don't have the same value. There's like conversion rates or something depending on the fandom 😆🤣