Playing against higher SP hangars is normal here - especially if you need 4 wins in a row :D 

Other problem is pairing a f2p player with rare/epic mechs with people that have all team with legenardy - look at my case where i have higher SP than opponent but... hard to win. 

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Their goal isn't fair play. Their goal is to frustrate you into spending money to upgrade. The thing is once you upgrade you will only get tougher matches. I stopped giving them money long ago because of this. 

That's my case, I'm a pay-to-win player with a completely legendary hangar, however, fighting against a hangar, even an epic mech with complete legendary implants plus mods, is simply impossible to win. It's no longer a matter of skill, but of simple math.

I realized that a 4-star hangar with some 5-star items is more than enough for fun. Reaching the endgame is a recipe for quitting the game, unless you have money to burn.

Unfortunately, these issues stem from the flexibility of our balance system and from matchmaking abuse. In Mech Arena, players can combine low-tier and high-tier content (for example, equipping a Common Mech with a Legendary Weapon), which makes it more difficult for the matchmaking system to find properly balanced opponents. Additionally, Squad Power manipulation can further reduce the effectiveness of matchmaking.

Our team is aware of these problems and is actively working on improvements. Please stay tuned -adjustments will be rolled out gradually 🙂 

So maybe devs should start to rebalance POWER RATING of mechs? Here is example:

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Both scout mechs. Tengu is RARE at IV tier, Eclipse is Legendary at VII tier and with max stats there is only 37 points of difference in POWER RATING and we both knows which mech is stronger by a lot. It should be like 400 to 900. The same with weapons.  

By doing that I could have SP +/- 2,5k or 3k while my opponent +/- 5k+. Then matchmaking difference max 1k and we have more balanced matchmaking

Totally agree, and this is actually one of my suggestions in the post "two simple, good enough patches for matchmaking". You can search for it. Sorry for not linking to it but I think adding links sometimes triggers the forum's spam bot and then it automatically bans the poster. 

Matchmaking will never be fixed. The community managers here have been repeating the same lie for the past four years. The lie ..."Our team is aware of these problems and is actively working on improvements. Please stay tuned -adjustments will be rolled out gradually."

They won't balance out the power rating for matchmaking. It will disrupt sales. Their goal is to put players against tougher fights to make them feel the need to upgrade to compete. 

They've created the imbalances for a reason and they won't change it, ever.