Slow and boring doesn't mean bad, unimaginative, uncreative writing. This problem goes back to the first season, where an entire war was started and finished within a single season, with no build up.
You're confusing "slow and boring" with "slow and deliberate".
Better Call Saul is slow and deliberate. It happens to be one of my favorite shows. It's also telling its story across six seasons.
Discovery obviously decided to tell its stories at a rate of one overarching story per season. If you're going to have a beginning, middle, and end in a span of 13 episodes, there's only so much you can do.
How do you propose to have a build-up to and resolution of a Klingon War in a single season? Which happens to be the first season. How about Section 31 in Season 2 or The Burn in Season 3?
"Errand of Mercy" (TOS) had no build-up to a Klingon War, but most people accepted that war was inevitable right from the first teaser. The writers of the 1960s assumed that people were smart enough that one line of dialogue would be enough for people to understand. And it's been understood that the threat of war with the Klingons was a constant throughout TOS and its movies. It's something Trekkies have understood
for decades.
You don't need build-up to a Klingon War
in the 23rd Century. The general assumption is that tension and hostilities with the Klingons was the default environment. That's the main point of
Star Trek VI: The Undiscovered Country! If you're doing a series in the 23rd Century, this is what it is. Peace and friendship with the Klingons would need to be explained. Not the other way around.
PS: It's interesting that when people complain about DSC, somehow it usually ties back to the first season. That's how far back you really have to go to make your point work?