BRJoker: Welcome. If you don't mind, what in particular makes this a long/slow playthrough for you? Perhaps I could change your view on a couple of things in the game? It's not as dull as it seems if you know a couple of things.
muddysneakers: I am admittedly not great at RTS games. I find the strategy for this one to be quickly build up a defense as fast as possible to stop the initial attacks, build up a good sized army and slowly try to find the enemy base, retreat several times to defend your base, find the enemy base and realize you need a bigger army, get a bigger army and destroy the base, find and destroy the 1-2 other enemy bases on the map, repeat for next level. At a high level this could probably be applied to a lot of games but this one just seems more stubborn. I especially don't like how your troops will spread out as much as possible despite me trying to keep them grouped. And the geishas only healing up to a certain level without micromanagement is annoying.
I guess most people indeed play the campaign that way because the game makes them to. I agree it's not a very good aspect of that game.
I've never been good at RTS as well since I never liked them, but BR captivated me with its design. It's different from any other RTS in my opinion, more of a local action RTS.
Knowing damage types and weaknesses/resistances of units would greatly aid you in making counters. There are also siege units that are great vs buildings.
With Dragon in particular you can scout the map with Archer's 'Zen Arrow' Battle Gear given in Shrine (Later on). You can also do that with peasants, or fast units like Samurai. With Serpent it's Raiders, Crosbbowmen (with phosphorous bolts) or Vetkin. Bandit with invisibility is not reliable due to the fast stamina reduction.
Generally you don't have to retreat to your base, before going away you can fortify it with watchtowers, building peasant huts around and bind peasants to a key so they defend the village and extinguish buildings if anything. If the enemy forces are always big in numbers you can basically just split your army like 'one for defending and another one for moving forward'.
Yeah, there are no formations and, in my opinion, it's another unique feature of the game. It's heavy on manual micromanagement, which is great, gives it that action feeling. You can keep your troops somewhat grouped by holding 'shift' and moving them. It usually works when there are no threats around. 'Ctrl' key is for force-moving, to ignore any threats around, so your troops don't get distracted/engage in combat unless directly attacked in melee. Also the 'N' hotkey for ranged units (stay ground but shoot if the range allows) and the 'O' for melee ones (passiveness, stay ground and do nothing).
Some helpful info:
1.
A very old (2009-ish) chart with damage types, weaknesses and resistances, it's mostly correct as far as I remember. I've got the updated planned (new, 100% correct charts) but can never get around to make it happen,
only finished Dragon units and ZM as of now.
2.
Siege Units. Not finished/polished, but gives more than enough info.
3.
My YT channel that would show you a different side of the game.
That's in case you're interested of course, I'm not gonna debate about that. We all have our tastes and opinions, I can only respect that. :)