The whole game is full of exploits really. It's not just the encounters it's the games mechanics. The fact that you can outrange agro from mobs is just bad. You can just snipe mobs and they won't do anything and on top of that Bungie gives you a sniper rifle that generates ammo automatically.
Nearly every boss of every strike has some sort of exploit to make it much easier than intended. Summoning Pits last boss, just snipe from the small room outside untill he is dead so you can completely ignore all the adds and the bosses attacks. The Nexus last boss, sit on top of the rocks and strafe to avoid the bosses attacks while also ignoring all the adds that spawn and there is also another spot where adds can't attack you and you can peak out once in a while to snipe the boss. Winter's Run last boss, you can just stay at the 'entrance' of the area and the boss and adds will just stand there around the corner unable to attack you. Cerberus Vae III last boss, you can hide behind some boxes to cheese the fight. And much, much, much more.
This game had/has a lot of potential but it's so short that it feels like half of the game is simply missing (they really had to add those 'expansions'...) and then becomes too grindy (I actually like grindy but not this...) and all these exploits don't really make it more fun either.
I had fun playing it, for three or four weeks. I didn't feel it was worth it to buy the 'expansions'.