Whenever you try using a balanced (physical personally, but any for this matter) build in mid-ranks, there is a 60% chance you will get thrown against some no-skill MB/CL spammer, and there's nothing you can do with it. These weapons are also some of the easiest weapons to max (They are rare, so getting,upgrading and ascending them take no time and are cheap af)
The Malice Beam is still bearable. you can counter it with any energy free weapon, so you still stand a chance. But the Corrupt Light, oh the Corrupt Light. Unless you have a heat-focused build, you're gonna be overheated in no more than 4 rounds. and from then on, they will just continue spamming the 2 lasers until you die. they also have fairly low heat generation and energy consumption, especially compared to their energy and heat damage on the enemy. and lets not talk about the fact that they have infinite uses.