I used to read intel reports all the time. Some were good. Some were awful. Most were adequate. It depended on the subject, time allowed to come up with an analysis, and the amount data use to compile a report or study. There was also a lot of stuff that really didn’t matter and resolved after a period of time, as more data was collected, or time saw change.
Yes thank you. It also depends on WHO is writing them and why.
Sometimes they're written to match funding requests, or to make some moron look good.
Some are *really* incompetently done and/or politically motivated, and cause huge problems and FUBARs.
As for the Russo-Ukraine war, there are reports that Russian military radios and communications security are especially bad these days, with even the high command forced to rely on vulnerable cell phones to get reports and issue orders. The deeply ingrained Russian preference for detailed planning and orders makes their military especially vulnerable to damage from communications leaks.
In addition, there has been a massive and apparently successful effort by the US and Western intelligence agencies to recruit spies. With Russia thoroughly looted by Putin and his allies and stuck in a failing war, loyalty to the corrupt and predatory regime is deeply impaired and ever more of those who have something to sell willing to do so.
I am not so sure that the current leak is not a planned one designed to demoralize Putin and the Russian military and intel services by telling them how badly they are losing badly. Already, there are published accounts from defectors that Putin is increasingly isolated and in fear of his life. That helps to make him even more vulnerable to a coup or assassination.