the point of a mesmer?
Pressure. In team fights you not only support your allies with damage and conditions but you also pressure the enemy via mass dazes(diversion), tons of reflection and ethereal combo fields for applying even more pressure via confusion and chaos armor. Not to mention in large zergs, diversion+bountiful interruption can get you quick might stacks to share with allies with signet of inspiration.
If you dont know the point of the Mesmer, well then you dont have to play it. You can play ele or necro or engie instead. Not sure from what point of view this question is supposed to be asked. Dungeon group? No point in any class other than Warrior. WvW commander? If you dont see the point of the Mesmer there then I wouldnt want to follow you with my Mesmer anyway. sPvP team? There is no point in sPvP to begin with. tPvP team? No point in any class other than Guardian. WvW roamer? Yes, it is rather pointless to play one of the strongest dueling classes.
Do u play a mesmer?
mesmer of Blackgate
http://intothemists.com/
http://intothemists.com/