TL;DR - If you're not interested in looking at numbers, you won't be bothered about internal weapon class balance. But if you are keen on laser balance, take the time to glance through the common lasers you use.
The numbers have been simplified for easy reading. Basically, comparing the Clan weapons to IS equivalents, and judging the advantage/disadvantage of the Clan weapon over the IS weapon compared.
The point is: for some weapons at maxed IS laser quirks (using the QKD-4G as reference), some Clan lasers are at a total disadvantage. Clan lasers are now good for poking while quirked IS lasers are good for poking AND brawling.
But before I begin, I'd like to shamelessly plug my thoughts penned down at the PTS sub-forums as follows:
My Ideal MWO State (Part 1 of 2)
My Ideal MWO State (Part 2 of 2)
Actually, there's probably more I'd like to pen down but they took forever to come out. I hope peeps can pop over and take part in the polls regardless. Especially for Part 2.
Now, let's start with the topic proper. I'll probably do this in a number of posts to possibly make things easier to discuss.
First off, IS vs Clans Total HP Comparison (accurate as at 26 Jan 2016), numbers derived from Smurfy's and Snafet's MWO Quirks List.

As can be seen from the compiled data above, the % differences in total HP (Armor+Quirked Structure) between IS and Clan is shown in the centre column.
Things to note are, those chassis with their total HP highlighted in yellow, are IS chassis that need more HP via quirks in comparison to both their counterparts in IS weight class or Clan side.
Those with red bolded text are serious offenders which are likely overquirked. Blackjacks are obvious offenders. Those chassis with green highlighted total HP are quite safe, IMO to leave untouched. Red highlight with yellow fonts are chassis with debatably high quirked HP.
I used a few criteria to judge them, namely, meta build ranges, XL requirements and their builds' alphas/DPS. Feel free to discuss them.
Next, I'm moving on to Laser balances, first by the Large Laser groups.
Edited by Onimusha shin, 26 January 2016 - 08:32 AM.