@Numenori
That's something I've thought about too, siege units are quite powerful against normal troops. I've seen the strength of artillery pointed out several times too. Something I could do is reduce the strength of siege by 20%, and increase their bonus against cities to 50%. This would place them weaker against normal units but about the same against cities.
Code:
Normal City City+GG City+GG+Morale
1.0 1.1 1.35 1.5
0.8 1.2 1.4 1.5
In addition to this, I could reduce the strength of Artillery a further 10%.
Regarding archers, one thing to consider is what Perkus pointed out: they do cost nearly 2 warriors, and most importantly melee units can get flanking bonuses while ranged units cannot. Three archers cost the same as five warriors, and those five warriors could potentially each get +45%
if flanked by two others. Archers are somewhat better at attacking cities (can't flank cities), but in the field warriors are quite powerful.
@Perkus
You're right that tanks are rather weak (I've never built one, mech infantry are just so much better and can be upgraded to), but I didn't want to overdo it with the buff. I've been thinking possibly a bonus from 50 to 60 might be warranted.
About promotion upgrades, thank you for pointing out that mod. I crossposted my thoughts on the topic in
Lord Olleus's thread.
@gandalf51
I suspect that marker is for targeting purposes. If a ranged unit could attack in melee, it would use its (low) base
when attacking targets one tile away, instead of the higher
value.