Haha, I have such mixed emotions about this Flintoff revisionism.
For all those who weren't around during the nitty-gritty of Flintoff's career, I was a main torch-carrier for the crowd that felt his batting was vastly over-rated. Even during his peak period of a couple of years where he averaged 40 odd against good opposition, he was never truly good enough to bat at number six IMO. It was pretty obvious to me at the time that he was enjoying a purple patch with the bat, spurred on as much by his personality and the momentum he could carry forward from his bowling, catching and the morale of an improving and winning side as it was by his ability with the bat. It was always going to fade sooner rather than later and when it did the selectors refused to acknowledge it, repeatedly selecting him to bat in the top six anyway to the detriment of his side. His batting average absolutely does his ability justice IMO and his century count is more of a reflection of the fact that he had a cemented spot in a plumb batting position for a large number of Tests than it is of his batting ability. He has less centuries in more Tests than Mohammad Ashraful for example, who similarly mixed awesome, memorable innings with large periods of barren production for much the same reasons. I strongly feel that Shaun Pollock would have a similar if not better Test batting record to Flintoff if he'd batted six for most of his career too.
So for all those reasons, I can't help but grin at history already looking at his batting a little less favourably, even if only on here. However..
The disparagement of him as an all-round cricketer is way over the top. Comparing his batting to Vaas's seems a step too far even to me and his bowling has IMO become pretty under-rated on this forum since he retired. The criticisms of him never ripping through sides and/or bowling the wrong length have been getting louder and louder, and there's obviously something to them, and they are backed up by his less than awesome bowling average. However his ability to build and maintain pressure was right up there with the very best I've seen this century. At the end of the day batting is about how many and when, but as a bowler you're much more looking to work as an overall bowling group, and Flintoff's contributions to that definitely went beyond the numbers a bit. I say that as someone who's primarily a stats man. A lot of people confuse "building pressure" with "bowling economically", and while there is some overlap I think anyone who's batted in a competitive cricket match will know it's not quite the same thing. Nathan Astle could bowl very economically without the batsmen feeling pressured at all in a Test match because they knew he wasn't threatening their wicket, but even if Flintoff didn't end up getting you out because he bowled half a yard too short to actually take the edge, consistently threatening to beat the batsmen on both edges with hostile, accurate spells back of a length really contributed to the attack. His ability to break partnerships is what I found the most under-rated though; he rarely took wickets in bunches because of the aforementioned length issue but bowling slightly shorter made him a greater threat to set batsmen who had their eyes in and were looking to play more expansively. That wasn't just the case during some mystical peak where all the planets aligned, but his entire career once he became a serious bowler. It wasn't a purple patch or a bit of a personality-driven momentum. Giving the ball to Flintoff when a partnership had developed became such a successful tactic and was a massive part of any close England victory. His contribution to an overall bowling attack was greater than an average of 32 or whatever he ended up with, which is why it's madness to compare his bowling with Kallis or Klusener.
His catching and leadership abilities don't seem to be in question here but they were obviously big parts of his threat as an allround cricketer, and even his batting - which I never thought I'd be defending on this forum - was obviously excellent in the context of a bowling allrounder, even if he was batting a spot or two higher than he should've been. That ability to carry momentum through from one discipline to the other when the team was on top, which I mentioned earlier as a reason for the quality of his batsmanship being over-rated to the detriment of the side after his peak, is still a valuable commodity for an allrounder. It allows them to make up for the fact, to some extent, that they might not quite be all the way there in one discipline or another by being able to combine both in one game to make a massive contribution towards a victory for one man. It's obviously not a quality I value as highly as many others on this forum but it's something that definitely needs to be taken into account when you analyse players such as Flintoff and Botham, no matter what extent you take it to.