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Zerg wasn’t as out of control as now. A thing WoL and hots did better.
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Protoss was horrendous in the pre-lotv days. Same warp in speed everywhere (made them frustrating to play against), turtle to deathball, not much harassing potential. Lotv did fix the warp in speed problems, but did not fix the turtly nature of protoss.
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Terran was solid in WoL, kind of sucked in hots and early Lotv, now terran is much better, i would say just as good or even better than in WoL.
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Macro mechanics, manually changing gates to WGs and banelings were all fine in WoL and hots…ruined in Lotv.
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Hyrdas sucked and were boring to use. Blizz made them much better in lotv.
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Mutas were fine in WoL but way too annoying and OP in lotv
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Medivacs were fine in WoL, there were no need for all the extra upgrades for them in lotv, except making their base speed faster, and one upgrade for them that increased their base speed, but no needed for the boost.
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Tempests and Liberators made games more boring to watch and frustrating to play.
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WP pickup range was fine in WoL and hots, not fine in lotv.
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Air is just too strong in lotv. No need for teleporting BCs, that dumb corrupter ability, speed basnhees, super mutas, and broken toss air.
I probably missed other things.
In conclusion, lotv addressed some issues WoL had (warp in speed, slightly less turtly protoss, a better terran race than hots and maybe even WoL). However, lotv did other things worse: out of control zerg, took skill and apm away from protoss (im looking at you adepts that keeps walking right after shade is used, revalation, and automatically changing gates to WGs), air units way too strong and frustrating to play against, protoss ground still sucks compared to zerg and terran in relation of harassing potential and solid and microable core units pre-splash, too many upgrades for medivacs, WP pick up range
I wouldn’t mind doing some reverts or slightly more reverts back to WoL, but keep all the stuff in lotv that actually made the game better, then re-balancing from there.
There’s really no more need for hard desgin changes, but rather smaller ones. Blizzard had a great solid foundation to work with in the form of WoL only to ruin it a lot in hots and ruined it further in some aspects in lotv.