DE weren't a powerhouse back in 6th. That was a really well balanced edition until the very last few books.
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Bretonia wasn't shite but a tad broken if they had luck with the charges, using artillery took skill, Beastmen weren't a joke, you could play LoC without needing an unbalanced book (Glotkin). And monster could do stuff without fear of being destroyed T1 because of the OPdness of artillery.
The only army that was unplayable was Tomb Kings, but they weren't as bad as 8th edition Tomb Kings. Funnily enough I started with the 7th edition box back in 2007-2008 ( Dorfs vs goblins) but in my FLS (now closed.) They kept playing 6th for a while and that's why I had a chance of playing it. One common reason is likely the further shift away from free army creation towards highly restricted lists.
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While 3E encouraged players to hold narrative-driven battles by providing the tools to create pretty much any army you needed, 4E and 5E were designed so anyone could play them out of the box without having to think too hard. However, since the designers expected a bit too much out of large swathes of their audience, this resulted in the Herohammer era where people would, as a rule and given the opportunity, create armies that relied heavily on powerful heroes with crazy combinations of magic items and monstrous mounts, warmachines and so on, with only the bare minimum spent on normal troops. Inspired by the force organization charts from the third edition of 40k, WFB 6E tried to fix this by introducing rules like core, special and rare units, and by reducing the impact of magic and magic items. Because it was the most balanced IMO. Also back then older races like Chaos Dwarfs, were still kinda viable, because their army books were still old, but not that old.
Bretonnia wasn't that shit. Then of course the overall lore. Panzer corps serial number search.
If i'm not mistaken 6th edition was the moment that Chaos got divided into Warriors, Daemons and Beastmen. And while the Beastmen army book sucked, it finally added more lore for Chaos. Then there's also the Storm of Chaos. People actually bothered playing the event.
Unfortunately GW didn't like the outcome. And fucked everything. 7th edition was going to be so interesting. With the Empire having to deal with the aftermath of the Storm of Chaos, wondering how exactly they can remain as the beacon of hope, considering their asses were saved by the Greenskins and Vampires of all things.
Hell, 6th Edition was so awesome, that i practically consider the Total War Warhammer series to be taking place in that time before the Storm of Chaos. Also there was that Albion event if im not mistaken, where the Lizardmen finally start moving on the Great Plan and build the first new Temple City. 6th and 7th are actually 'mostly' similar to each other; the differences between both are smaller than the differences of either compared to 8th. Really, the main things unique to 6th were: • Infantry got rank bonuses for being 4 models wide instead of 5-wide (only needed 16 models for full-rank bonus instead of 20). • When an infantry unit won melee against an enemy unit and said enemy unit did not break, it could have two models 'lap around' the enemy flank. Thus rather than it being 4 models fighting 4 models, it would be 6 versus 4.