This show is a little bit of a nice surprise, based on the comments i thought it would be terrible, nearly as bad as Abyss. Luckily nothing in the show annoyed me in a major way. Doom is a nice fluffy drama with some slight melodramatic vibe. I had a pretty good time overall, I enjoyed even some of the most criticized episodes.
I mean sure, the storytelling is a bit arbitrary and abrupt at times and the second leads do form a love triangle, but the (Beauty Inside) screenwriter has redeemed herself with giving me a nice, easily digestible ending and the second leads were a lot more entertaining than I thought they would be. The triangle did not devolve into a makjang-ish mess and it almost made sense, almost. it goes without saying that I found great that the main leads had no secondary romantic interests.

The two biggest problems I've found with the drama were the somewhat lacking chemistry between Park Bo Young and Seo In Guk and the lack of impact. The chemistry issue somewhat resolved itself by the time we reached the ending credits, it's obvious that the actors have grown used to each other. As for impact, let me explain. The theme of the show and the events that happened between the leads should've felt extremely impactful. Perhaps the writer failed with buildup a little & perhaps there were some acting hiccups in the delivery too, I don't know. The slow pace and all the gazing did not bother me at all, but I cannot help but feel that there was more than enough time to properly build up to those dramatic plot developments & make them less arbitrary, less immersion breaking.

As I have mentioned already the writing is less than flawless, but the frame of the story is really sound. It's properly written, it's not a cliche fest. The one big cliche plot the show had, the memory loss thing was well executed. Then again I always liked it when lovers reconnect after an amnesia situation. it's commendable that no third party with ulterior motives tried to take advantage of their amnesia.

The cast on the whole was really on point. Everyone was pretty great at their respective roles, except Kevin. Not the actor's fault, but good God they should have given him less screen time, nobody involved knew what to do with his character..
I loved the deity. Her difficult to explain decisions notwithstanding the actress did an absolutely phenomenal job, I enjoyed every second of her being shown on screen. (and she did have some great lines as well)

This drama has many similarities with Angel's Last Mission. That drama is better due to Shin Hye Sun's acting & the OST, but that's pretty much it, though that's admittedly quite a lot! Doom has a hugely better ending & a more balanced cast.
Another point this brings up how strong an effect music can have, when it comes to enjoyment of a drama and there Doom certainly falls a bit short.

The line about "writers being technicians" amused me to no end . It could be a fitting motto for the screenwriter. (especially if we consider The Beauty Inside too..)

TLDR: Doom is not the best drama I have ever seen, not even close, but it's been entertaining during the show's entire run and it has wrapped up in a nice way, so I'll go with 8/10.