scrubbed because bloom is unwinnable
This is precisely why I didn't play Burn at my PPTQ and don't like it in general right now. I've gotten a lot more risk averse over the past year regarding my deck choices and I prefer piloting something that can interact with the unfair decks in a meaningful way, and Burn doesn't really have this option. It's still a good deck and the correct choice at times though.
Live by the sword, die by the sword.
The same is said to every deck in Modern, it really is Rock, Paper, Scissors - even decks like Grixis Control sport >40% winrate against other builds.
While its its true that with Modern's landbase its possible to splash colours to answer everything for anything, the meta is just to large to build the "All-Rounder" thus all decks are force to accept some poor MUs.
- - - -
That said according to Goldfish's SaffronOlive article - Robots/Affinity is the best bet for highest winrate:
"Affinity has the best overall winning percentage out of the 10 most played Modern decks coming in a bit over 55 percent. Better yet, it has a killer matchup against the two most played decks in our field coming in at 63 percent against Naya Burn and 59 percent against Grixis Control. This isn't even considering the positive matchups with R/G Tron, Amulet Bloom, Jund, and Merfolk. So we should all just follow Frank Karsten's lead and play Affinity right? Not so fast, there is one very big problem for Affinity: Splinter Twin.
The Affinity vs Splinter Twin matchup is the single most lopsided matchup among all tier one decks. It is basically the Miracles vs 12-Post of the Modern format. In fact, Affinity only managed to beat Splinter Twin 36.8 percent of the time over the course of more than 150 matches. Considering that Twin makes up somewhere between 4.7 and 8.4 percent of the field (for some reason Twin is underrepresented in our sample compared to the Modern Metagame Page), if you choose to play Affinity at a big 15 round event you are almost starting off with 0-1, since you are likely to run into Twin at least once and probably more often at the top tables since Splinter Twin also has a solid overall MWP at 53.6 percent. "