Not sure what you mean... That melee is too strong or too weak?
More like running up to enemies often spends a lot of TU, making melee at best a huge dice thrown. Sprinting helps with that, but then you run into Stamina lack sometimes (which is cool, especially with items to refill it). Not so much in X-COM Files, but in PirateZ stamina is a very important stat - the best melee warriors are the ones with good enough stats to run at super-human speeds and then destroy their enemies with blades and blunts like the fists of a angry god. Not to mention enough beer (or X-Grog) to keep stamina up during combat situations.
I really need to test melee more in X-COM Files. I'm too much of a cautious dude so I really don't know when to simply CHARGE MINDLESSELY TOWARDS THE ENEMY! Even when I should!
I have done calculations with Machete and it seems like I could be dealing upwards of 50 damage with it in the hands of the right agent. Considering it doesn't even use 10 TU, I could be dealing like +200 damage in a turn, turning pretty much anything devoid of armor into chunks of meat - assuming the agent hits. That's WAY better than anything I got at hand in the moment, and right now "anything" is the Hunting Rifle, Magnum and my recently-researched HK. I gotta train my agents in melee - machetes might be the next best thing against the zombie menace.
I still remember how I had zero respect for knives in the FMP, until I once got a situation where I won a Terror Ship with one man standing, a sniper with a unloaded Tac Rifle, a alloy knife, and a ship full of smoke and sectoids. Sniper Shivs Sectoids, Ship Secured Safely!