There are side quests and searching planets can keep you playing for some time but me2 unlike oblivion is pretty much linear. You can replay the game few times with one character tho. Its a great game but i cant imagine it lasting for 6 months. If you need something with great replay value you should maybe try looking into different games such as new vegas if you havent played it yet. It has alot more content than ME2. Oh and i dont see why you wouldnt buy the first game, its probably alot cheaper and just as good, maybe even better since it definitely has a better replay value than me2.
Tf2 shines in competetive 6v6 gameplay. You should first learn all the official maps, learn to play one class well and start playing pickups at http://tf2.multiplay.co.uk/pickup/ or you can register in european tf2 league and start playing there. Dont stay in pubs(public servers) for too long.
You should also check out steam's TF2 forum. Theres a nice topic about competetive.
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