HUcasts and Mechguns, as one who uses a pair... Options

[unitself]

I have heard that alot of PSO'ers don't like this combo. I have always wondered "why"? Do people feel that the HUcast is simply too strong and takes all the exp. away from everyone? Everyone I have ever played with has always done much more damage with their than my mechs do. Not to mention the fact that I stand there for a good three seconds or longer after firing, often getting me smacked upside the head in the process.
I understand about the people with the Spread Needle. I totally get that one. Not only does it exp hog, but it also kills everything in 1/4 the time which in turn kill all the fun. But, I have never experienced that when using my mechs.
So, what's up? I am asking cause I don't want to (I guess) continue to cheese people off when I join a game with my mechs.