He is overrated in his era by some pundits as the 'greatest cricketer ever' since there wasn't an AR near his level to compare so he stands out and they look at his raw numbers.
He is overrated as a bat on CW that considers him an ATG, yet he lacked the ability to dominate attacks which is an important criteria to be an ATG bat (it's not just about aggressive scoring, also daddy tons where he was also lacking).
He is overrated as a bowler based on bowling load he took, minnow bashing and being that useful only on helpful pitches.
Your problem is you will never subject Kallis to the level of scrutiny you do for Imran for your own reasons. Have you ever gone into scorecards of Kallis innings or who he has gotten out, average/WPM, have you ever gone into county breakdown of his bowling, etc. You didn't even mention minnows until it was brought up.
Your analysis of Kallis is entirely superficial and general, probably because you want it to be.
Thankfully based on the latest poll, Kallis is being slightly downgraded here on CW which is overdue.
We're not taking about the same idiots that think Anderson is the greatest ever, were talking primarily about on the forum and by knowledgeable pundits.
There can be no argument that he's an ATG bat, and any such argument is tinged with bias. He had the toughest home conditions in an era of pancakes and still kept pace with all the greats of his era, including Sachin. Yes, his reluctance to accelerate as demonstrated by some of the others keep him below the upper levels of the pantheon, but he's still an ATG. And let's not pretend that Sachin's overall scoring rate was that much higher than his, and neither was close to Ponting's or Lara's.
Everything you say about his batting I can make a comparable argument about Imran's bowling. Neither were their primary strengths and neither quite live up to the stats. One had minnows and the other not outs, downhill skiing and padding.
I rate Kallis for what he is, a test quality 4th bowler, who was better suited for the 5th slot. The same way I rate Imran for what he was, a test quality no. 7 who was best suited and provided the best advantage at no. 8. Neither of them rock my world.
How is it superficial. He's a top 15 ATG test no. 4, the 2nd best 5th bowler ever and a top 10 slip fielder. Same way Imran is a top 10 bowler and the best lower order batsman to play the game.
And yes, you will harp on a one place drop to 4th until the next poll, which you'll likely ignore. As you do all of the other polls that you disagree with.
As a player and looking at on the ground, all round value to a cricket team, the only player in history that beats him is Sobers.