I have no problem labeling Walter Model as the most skilled commander in the Heer (certainly in the top 3)
His failure to capture Sevastopol in the initial rush during operation buzzard could hardly be labeled a command failure... he had no panzer divisions at all, and half of his infantry divisions where Romanian with shitty weapons and poor doctrine vis a vis his German divisions; the lack of mobility which he had no control over stopped them from taking the city in a coup de main... he still captured a lot of troops and territory relative to the forces he had on hand and decisively won the campaign
Which Leningrad operations are you speaking of 41 or 42? His drive in 41 is still mandatory study at Ft Knox armored school; his small corps of 1 panzer, 1 motorized infantry and 1 line infantry division advanced 250 miles in 5 days and facilitated the capture of 65,000 Russians; his advance only stopped due to the incompetence of Leeb and the numerical weakness of army group north/panzer group 4; plus he was transferred out before the really stupid decisions and general assaults where taken at Leningrad so he is not responsible for them
Leningrad 42? His army walked off their trains into a titanic meeting battle; which they won despite losing him to command army group don just a couple weeks later and being stuck with a logistical and tactical nightmare before the battle even started; the Sinyavino battle (which is the only one Manstein was there for) did force the Germans (along with Uranus and Mars) to cancel their proposed renewed offensive against Leningrad, however Manstein's troops inflicted a body count of 5 to 1; and yielded little ground and left the Leningrad military district's forces comprehensively bloodied.... how is a battle where you hold your ground and inflict 5 to 1 losses (with no tank divisions no less) "pathetic"
That isn't to say Manstein didn't have some horribly managed battles; you just chose the wrong ones
.... Mius was by far and away his dumbest move; sure the 3rd panzer corps crushed the divisions who crossed, but he completely ignored his left flank which Zhukov then visited with 1.4 million men in 18 armies backed by 1700 tanks and 4000 aircraft and 7800 cannons... the defeat there was more epic and impressive than Bagration or Sickle cut