No he needs passive armour. Not gun sheild that basically does nothing in all fights since 50 armour doesnt even tank more than 1 click of a shotgun, thats if they dont click on feet or heads. The sheild bubble should not allow enemies to go inside or be placed when enemies are near, the bubble 100% of the time is just rushed leaving it completely useless, everyone just dances in and out with the huge hitbox advantage its situational use is long range sniper fights, which being the large glowing target and your the larger hitbox you cant win. Gibratar clearly needs reworked. Now i agree he has the best ulti in the game, ive won a few games just because of it. But the whole match i must hide behind my team mates the entire fight with a sniper, i feel useless, a big distraction, a walking hitbox.
These changes would suddenly make him very viable while not making him overpowered.
Caustic is fine hes a camper god, the gas is very strong at getting free hits, hes large but i notice i barely got hit compared to Gibraltar.
Caustic i won very quickly matches by hiting his ult in enemy fire fights, gas traps are great in any house situation. Ive seen very strong caustic mains, never seen a single good Gibraltar.