Can't say how easy controls are when playing in the Vita but I had no problems playing the game on PC.
Recommendations:
1) Know your surroundings:
Always identify a place you can run to and take cover from enemy fire.
2) Look for balanced shields that have a high recharge rate and a good amount of capacity.
3) Pick Zero, he fucking goes invisible and his ability gives you time for your shield to recharge.
4) Equip different gun types to have different ammo to spend.
5) Increase ammo capacity for each class.
6) Don't go suicide when entering a level, when enemies are clearly visible ahead of you. Instead, initiate combat with some sniper shots. Kill as many enemies as you can from a distance and only change weapons when they get near or you run out of sniper rifle ammo.
Nintendo is selling their IPs to Microsoft and this is true because:
http://gamrconnect.vgchartz.com/thread.php?id=221391&page=1
