Simply put, this game is awful to actually play. If that's all you need from a review, you can stop here. If you want to know WHY this game is awful, keep reading.
The story is pretty uninspired. It's not completely terrible, but it's nothing you haven't seen before. Maybe it gets better, but I couldn't get too far due to numerous frustrations before I dropped the game. The voice acting is at best, average. WIth woodenly delivered lines, and dialogue that could have been written by a chat-bot.
This is the main problem. An average to below average plot/voice acting can often be made up for in gameplay. Unfortunately these developers seem to have forgotten how RTS' work.
Problem 1: The perspective and selection of units.
The angle of the game, and the awful awful unit boxes make it very difficult to get all your units, or select individual units, or really do basic things quickly and efficiently. Did you miss on of your units when trying to select it? Well screw you player! Because now you have NOTHING selected. Isn't that great? There are several abilities in the game that you are to use on a singular unit. This is difficult and can cause issues. Anyone who is used to a well made RTS, and want's to micro and control army effectively is in for a bad time. This however, is not the only contributor to that bad time.
Problem 2: The (lack of) pathfinding
You know when you play a game, and sometimes your unit happens to go a weird way around the map to the location you sent it to? Usually doesn't happen that often, and usually isn't a big deal. That's not the case In Meridian: forgotten mechanics. Do you want to move somewhere specific? They will eventually get there. Not together, not in a timely manner, but eventually. Just hope there are no enemies to fight.
What happens when there are enemies? Well I'm glad you asked! See, if you run in to an enemy, while moving around the map, chances are everyone in your dumb as hell army has separated into squads of 1. Thankfully, the enemy AI will just put them out of their misery. Now, it is possible you'll actually have your army together and want to attack. One of the basic moves in an RTS is to Attack move. In almost every RTS ever made, as soon as an enemy is in sight and range, the guns start blazing. In "Meridian: What LSD trip made us think we knew how to make a game", you will find, at almost every occasion, your units running directly at the enemy without firing. Without realizing that they are NOT some sort of kamikaze unit. Without deigning to obey your commands in a remotely satisfactory manner.
Thanks to these amazing mechanics, you often need to retreat to try to herd your dumb struck army in to a semblance of a group so you can actually play the game. In most RTS' retreat is a viable strategy. In "Meridian: Oh my GOD does anyone know how to walk?" this is nigh impossible. Retreating involves attempting to move away from the enemy. In the unlikely event your units actually manage to walk away from the enemy, you will find them immediately attempting to engage the enemy. The worst part is, the terrible pathing and AI means that they will have half trying to get back somewhere, half who are going the other way and get stuck on eachother, and no one actually firing on the enemy OR retreating. The target acquisition range is just absolutely nuts. It doesn't make sense. I've had units react to hostiles WHO WEREN"T VISIBLE YET. I'm pretty sure Chewbacca lives on Endor, because it just doesn't, make, sense.
Hotkeys. I get having your own hotkeys for your game so you can be "different" so all the cool kids will like you. But changing fundamentals like moving the hold position command from 'H' to 'E' is just plain stupid. There's many similar changes in this game. "Meridian: who even needs hotkeys anyway" decided to reinvent their hotkeys from the refined version most games have settled with, to a new pile of crap that no one wants to be in.
This is the only area where Meridian: Really Shiny gets any sort of credit. I'm not saying it's a visually stunning masterpiece. But it is nice. It's vibrant. Also really shiny. Nothing to write home about, but nothing particularly bad either.
Final Thoughts: There are lots of RTS games out there. There is a reason that Command and Conquer, Warcraft 1, 2 AND 3, Starcraft 1 AND 2 are all timeless classics. There is a reason that most RTS games have similar if not identical base mechanics to each other. It's because they WORK, and they work WELL. They allow strategy, micro and macro. Meridian: Barely a functional game decided that's not necessary in their RTS. They wanted to be different, to be cool, instead everyone should be making fun of them and ignoring them.