I don't know about you but twenty buck and twenty meld for a MEC trooper with guaranteed damage weaponry and guaranteed, repeatable cover destruction is not too high a price to pay.
Ok, well, just hear me out
A MEC has the following base cost
20$ and 20 Meld for the unit change
25$ and 45 Meld for the first mech itself
29$ and 60 Meld for second iteration
110$ and 100 Meld for third iteration
One starts the game with 100 Meld.
Positives of a MEC
Good defense
Good base attack
Good AOE
Good cover destruction
MEC can be re-used if soldier dies
Negatives of a MEC
Unable to use any type of cover
Very low crit rate
I see how a MEC could help early game when you are desperate for AOE and something that can soak up damage. In my opinion, the lack of cover ability and high Meld cost make the MEC a bit too costly. 65 Meld for a level 1 MEC is kind of a lot IMO.
I prefer to go the bio route
Neural Dampening
$35 and 20 Meld
Grants a soldier +20 Will when defending against a psionic attack, and becomes panic immune. If the soldier is successfully Mind Controlled, the control is cancelled and the soldier is rendered unconscious for one turn.
Your soldiers are rarely mind controlled and immune to panic.
Unlocked by Berserker autopsy
Secondary Heart
75$ and 15 Meld
Causes a soldier to be critically wounded, and therefore have the potential to survive, instead of dying when suffering lethal damage. Extends bleed out by 2 turns and the soldier won't lose Will from critical wounds.
Your soldiers never die after their HP reaches zero. Bleed out time is extended by 2 turns for a total of 5 turns.
Unlocked by Cyberdisk autopsy
Both are late early to early mid game upgrades.
Let me give you a few examples
Was on a mission, my support class took two critical hits. Instead of dying, he was knocked unconscious. I was able to win the mission in the next 4 rounds, saving his life. He was the second to highest tier ranking and would have been lost without the upgrade.
During base defense, I had several units that had mind control attempted on them. All attempts failed. This rendered the enemies attack useless while I cleaned house. The situation went from a potential disaster to an easy coup.
I think MECs have their time and place. It may be worth it to get a single MEC in early game to help while you are working your way up to laser weapons. Getting to late early/mid game, I think its much more useful to spend your money and time making general units more effective and resilient and not to spend a ton of money on one or two MEC units. Survivability of high level officers is paramount IMO.