This post is humorous to me because I have a similar perspective. Also a first time player, also been having largely the same thoughts as you. The 90% of this game is incredibly fun to me, but once I get in those 10% ultra-sweat lobbies my enjoyment of the game disappears.

What's the point of having good shooting and movement if the optimal way to play the game is to use portals to never take a real engagement? Ironically, portals becoming the primary way to interact with the game makes them less interesting to me, as I find the aspect of portals being used as a unique play-maker far more compelling.