Uggh. This thread frustrates me. Okay, the reason why I said using ubers/legendaries is lame is basically because if you're competing, it completely ruins the metagame. Let's say my team was Chimecho, Charizard, and Jolteon, and you had a team with Mewtwo, Ho-oh, and Raikou. Assuming that you're NOT a total retard, the difference in stats is so staggering you almost automatically win. If everyone used ubers, that would eliminate a good 90+% of the Pokemon in the game, taking out the strategy and variety of battles. Setting simple ground rules like no ubers at the very least (I don't mind legendaries as much, because regular Pokemon can take down legendaries) essentially makes the game not only a lot more fair, but a lot more diverse between player to player, and opens a lot more room for strategy and uniqueness. I'd rather not participate in the game when everyone uses Mewtwo/Groudon/Kyogre/Dialga/Palkia/Ho-oh as their team. I'd rather be able to differentiate myself from my opponents.
And...honestly, saying that people are trying to insult you guys because they CAN'T catch legendaries is pretty stupid. It's pretty easy, for one, and typically the ones who oppose the use of legendaries are skilled enough at the game to not want to rely on them for use.