(Read first post, didn't read the rest, sorry if I restate something.)
I started in a Hunchback 4J back when it was a trial mech. I found LRMs to be a great starter weapon in that time. I bought a Hunchback 4SP and rigged it up like the 4J, except without the "all LRMs in same place" vulnerability. It did well. Eventually, I moved on as I learned the system more and sold the mech.
Here is a hint, I liked that mech so much, I ended up rebuying the Hunchback 4SP, and it's still a ride I love to drive. I find that the LRMs give me reach, which is good as my Hunchback isn't all that fast. Then, I place lasers on for a good close range defense.
I say this, so you know I've been using LRMs for a while (currently playing a Quickdraw, which I have an LRM version). Though LRMs can have their weak points, I feel they are still great weapons to use for veterans, as well as green recruits. The trick is to learn to hang back, which a green pilot is more likely to do. This gives you time to learn the other controls, while still being able to (normally) help the rest of your team.
I suggest you have enough lasers to protect yourself (my Hunchback 4SP has 2 LRM15s and 4 Med Lasers, with Endo and Double Heatsinks, but a Standard engine). With my setup, I control when I wish to engage (most times). I can hang back and use LRMs, or close in for laser work. The best spot to be is around 200-300m, as then all my weapons can be brought to bare on the enemy. (My first 4SP setup had 2 LRM5s, and 5 Med Lasers, moving with a faster Standard engine. I have since adjusted, but LRM5s are very efficient.)
Don't know if you would be interested, but I have an LRM guide posted on this sight that might be helpful for you.
http://mwomercs.com/...05#entry2474605
Personally, I feel that a med mech with LRMs isn't a bad idea. You are fast enough to stay away from most enemies (or close in to range), and small enough to be able to use most cover provided for your own benefit. (You also will get overlooked if you hang out with the big boys. Most people will concentrate fire on an Atlas, rather than a Hunchback.
I wish you luck in your games, and if you ever want a Wingman and I'm no, just ask. I'm usually open for any groups.