You just don't understand the competition. The competition in gaming is not at all the same as the regular 'public' play. Competitive gaming is about developing and resonating on new advantages that other teams do not have and then applying them in carefully orchestrated strategies. You're right that it's not fun for you because your expectation of the game is similar to how the game was advertised. The people having fun with competitive gaming are reaping the rewards of hard work and the feeling of success when some very intricate feat the team developed actually worked.
A great example of what it means to game competitively comes from the Kubra Dam map on 8v8 battlefield 2. On that map there is to most people only one way for vehicles to go at the beginning -- straight across the top of the dam. If you tried to get to the lower part of the dam from the MEC side, you'd have to drive a long snaking road in the wide open. But.. while screwing around, my friend and I accidentally drove the MEC Vodnic (van-like vehicle) off of the top of the dam at the spawn down a huge veritcal drop, and the vehicle didn't explode! We were very surprised and *knew* immediately that we had discovered an advantage nobody had but needed to figure out how it happened and how to use it.
This then became an event taking a full evening of testing to find out that if you drive the van off the cliff at the right speed, and the front wheels go off, you can hit reverse, which would stop the vehicle from flipping forward while braking, and keep the vodnic level as its rear wheels exited the cliff lip. The vodnic goes off the cliff perfectly flat (when trained correctly for a couple hours), and lands on all four wheels. This makes it bounce very high and lose half of its health, BUT IT SURVIVES! And so this gave us a strategy nobody had. We could use the vehicle from the breakout, load people up on the top of the dam at the full frontal attack, but run one guy off the cliff in the Vodnik across the bottom of the dam, unnoticed, and into the USA Main base in under 30 seconds. This was not even known to be possible, so arriving in that base is unexpected and unprotected. The guys ramming to the full frontal on the top of the dam are battling alongside tanks, but to be smart, they are in the squad of the guy in the vodnik arriving at the USA main. This means that if your push for the middle flag gets killed, they will take it and it will stack the invasion of their main base further against them as those guys respawn in on the USA main that is just now being invaded.
The end result is that no matter how you approached it, you would capture key flags, and if necessary, the enemy would be left without any main base, stranded in the middle of the top of the dam.
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And that is just a glimpse at one technique required to win in the top of competition. When my crew took the TGL 8v8 world championship, we had a shoutcast with 2200 viewers. It was pure glory. We even took a game from what is known as the best BF2 team ever, Team HOT, in the TWL 12v12 ladder because we had a large array of these awesome technical feats trained for Sharqi Peninsula, and I developed a strategy for about 60 hours of effort and trained all 15 members (backups included) on how each stage of the strategy should happen and what fallback procedures would occur if primary objectives fail. We sacked their main in under a minute.