New league member: gap closers suck Jax sucks or lee sin is overpowered

Sry for bad English, first of all. Riot, some champions suck. I was playing a game with Jax in ranked games with enemy being Lee sin Teemo Morgana Diana Ezreal

And us being Graves Blizcrank Ziggs Jax Talon

We won some kills early game and caught lee sin off when I used stun and we are ahead of kills with phenomenal ganks. but late game we absolutely fall off.

Lee sin just q'ed everywhere provided aoe cc with his ult Diana just used her aoe cc to drag everyone in (I don't even know what ability it is) Morgana q everywhere Ez just jumps everywhere and builds ap and gets bursty.

We are a low mobility and relatively low cc team (compared to them) they jumped everywhere and we died. I build tank Jax went in and followed up for every team fight. They just jump away and when we are all low, they re-engaged with their gap close. We are good players and Ziggs almost got a penta.

I got extremely tilted after that game considering I am kinda a Jax main (even though not that good, but I know how to ward q) I feel like really old champions like Jax are lagging behind, new champions and gap closers are too crazy.

PS: what the f--ck i just ward jumped away and lee sin q cd is done already and my q is not my for another 8 seconds while dinana is chasing me and used her pull thingy (lee sin misses all q ) then i jumped to Ez (hes low and can be killed with one aa) Ez jumps away and uses all hes abilties and i continued dodging skill shots and jumped to Ez again then he flashed and i am out of mana then he ulted me while diana went all in and shreded my tank build in 2 seconds while my team is f--cking doing everything right and f-ck they just kept jumping and bliz grabed diana at full hp then hes dead in one second (tank build) while talon jumps around like a "challenger" dealing damage and stuff and talon "wtf my team is dead?" then hes dead after taking down 3 people included in my assist.

FUCKING TILTED sorry.