Just hiked Kesugi Ridge last week... great hike. The trail is very well marked and once you get up the initial ascent, it's mostly an easy trail that meanders south down the ridgeline, not much steep stuff at all. We pushed through one day of serious rain, and even with all that water, the trail held up pretty well. It is mucky in places and descends into a few river valleys that are definitely waist-high foliage that can soak you if you don't have rain gear on... but overall a great trail. We went from Little Coal Creek to Byers Lake, and the only tough areas were the aforementioned valleys and the descent into Byers Lake was pretty muddy and rutty and steep. Awesome views of Denali and the Alaska Range and easily doable in 3 days. I highly recommend it.