The problem with 7th/8th is choices made to win the game, made the game less fun. Half of each army book went unused in competitive play. Why the hell would I take a unit of 25 regular orcs in 8th? S3 isn't average, it's bad. Most take a horde of savage orc big 'uns, a NG horde, etc.
How much dust are on your handgunners right now? Mortar? HSRB? Flagellants? Militia? Swordsmen?
Most army books have a large section of crap, which doesn't see the table. This is a problem.
Flying circus WoC army. Perfectly legit in 8th, and very effective. Makes the game less fun.
One saber tusk misdirecting a 50 person horde.
Auto win spells, choir, 5/6 of your dwarves/trolls dead to purple sun, AOE soulblight, test or die with no look out sirs or saves.
Cheap heroes means certain armies can spam them. This NG horde has 6 night goblin big bosses, please allocate hits, any extra wounds are wasted. Not to mention, my L4 and BSB are hiding in the 2nd rank, you can't touch them for 2-4 rounds. This is bad for the game. This makes the game less fun.
Comp systems helped to make more units viable, and games more closely matched as a result.
I liked 8th a lot of the time, but many aspects of the game made it less fun. There is much more reliance on dice rolls, less on tactics, this makes it less fun.
Since AoS I've thought a lot about what would be FUN to have in a war game. I honestly don't think any answers have come to me.
In regards to the initiative topic;
There needs to be a system which takes into account every aspect of the game, not just large blocks, elves, or spears, etc. Goblin wolf riders cannot charge 1/2 the armies in WHFB, without taking hits first or at the same time. This is a problem.
Elves getting rerolls against everything but elves, problem.
A flanking unit of knights getting smacked before they can attack, problem.
3 tiers of attacking order complicate things, but I'm not sure what else works.