@mburgos031 I no loner think about it but there are a few issues with it. Only focusing on the two I care about here:
#1. The smaller you are the more likely your opponent is to miss you. As the movement skill of the player increases the greater this difference is shown. I don't care how great your movement is I'm unlikely to miss many shots on Gibraltar so his best bet at survival is tanking hits (which he does irritatingly well.)
#2. The smaller you are the less likely you are to be targeted in an ambush or third party situation. Playing as Gibraltar during the first few seasons I seemed to be everyone first target in an ambush. When I was forced to play as Lifeline I was surprised when an ambushing team didn't immediately drop me only to see that our team's Gibraltar was on the ground. Bigger target = more likely to be targeted.
If Wraith is no issue for you then you either have above average aim or only fight the majority of mediocre Wraiths.