The reason why the game seems hard...

I'm fairly new player lol but this game is not hard the only reason I'd die 35 times on a boss lol it's just I had to learn the patterns because the issue seems to be the lack of weapon drops and dps last night on act 2 final boss the only reason I couldn't beat him and takes for ever to kill him was because I wasn't good enough to avoid the damage for 15 min straight lol...went to town picked up a blue crossbow with like 5-20 points of damage more two sockets upgraded to yellow with 6 affix that sucked but went back and killed in 10 mins instead so I mean I don't understand the hard it's not hard it's just lacking dps but I've had one crossbow drop in my whole playthrough and some that dropped where way to low in damage for me to even bother to upgrade...and when I'm fighting boss I get to a point where oh boy this gonna take a while I've beated boss like that so boring but was good enough to avoid the boss patterns and have enough potions for a 20 min fight of avoiding and doing no damage barely lol...