What are the main things you want to see fixed from EB1 in EB2???

[Mediolanicus]

What I want most is the "minor factions" introduced in ETW, they're not complete factions hence not playable, but they're independent AI factions.
So every Eleutheroi city would belong to their respective minor faction which fails to qualify as a major faction, rather than all belong to a bizarre huge faction called Eleutheroi.
However I know this feature is not in M2TW...

That's what I like most in EB, and will be improved in EB II. It is also the reason I can't play any other mod out there.

In EB every province is unique and has its own character, whether you control it, an AI faction control it, or the Eleutheroi control it.
Many small independent factions would be nice indeed, but the EB team are doing a magnificent job within the limits of the engine to represent each independent region.

[WinsingtonIII]

On the subject of veterancy, keep in mind that veterancy in M2TW is toned down quite a bit from RTW veterancy. In RTW and EB, it was +1 attack +1 defense skill with every single chevron, plus, I believe, a morale bonus that I am not sure about because it doesn't show on unit cards (I still cannot understand why morale is not shown on unit cards in both RTW and M2TW btw...).

In M2TW, the first chevron in each "level," aka the first bronze chevron, the first silver, and the first gold, all give +1 attack. However, there is no defense skill addition, and they only get +1 attack for these three chevrons, not for the rest. Again, I'm unsure about morale bonuses. But this definitely is not nearly as much of an overall bonus as in RTW. With all 9 chevrons, a unit only gets +3 attack, as opposed to +9 attack and +9 defense skill.