I think the complaints are a case of players sticking to one side, and then having a bad game and claiming the other side is more powerful because they do not understand how it works.
I personally consider clan mechs to be superior in ever way, but that is because they cater to my prefered playstyle and not because they are actually better then IS overall. Clan mechs are better at mid-long range, since they get the cERML, which works very well at 500m, a distance where the IS ML is crap, and the cLPL is also great (although i prefer 1 cERLL+2 heat sinks over 1 cLPL most of the time).
In terms of what ive seen sofar, the major upsides of each faction are as follows:
IS:
Ballistics (all your alpha into 1 component is better then even the UAC's doubleshot feature imo)
LRMs (aside from looking like ugly yellow blob launchers they are better in every way to clans since you dont really want to use lrms at pointy blank anyway)
Survivability (alot of structure/armor quirks and anything but lights and mediums dont really use XL minus a few very specialized builds)
Cooler energy (better heta efficiency for lasers provided you are within range of em)
Shorter beam duration (major benefit against fast mechs like lights or when trying to take out 1 component)
No locked equipment (i can ditch JJs since i dont like them much on anything that isnt a light, no forced anything
Decent lights (plenty of light mech options from snipy ones to brawlers, and all of them are quite mobile unlike clan's only decent light the arctic cheetah)
Clan:
More firepower (XL engines and generally lower weapon mass makes the firepower superior on most builds)
Faster (XLs on everything and with a few exceptions aside, no clan mechs are terrible in teh mobility department minus lights)
Longer range (lasers especially ERML are better at mid-long range vs IS)
Customizable hardpoints (dont like energy, dont bring energy, dont like missiles, dont bring missiles, ect)
ERSL (ok, this is the ONLY weapon as of now that id consider OP in every category on a mech that can actually get within 200m of the enemy, super heat efficient, great firepower, non-existent mass, and you can boat em in numbers as high as 12 giving you ~60 alpha every few seconds)
Given that i enjoy mid-long range, value mobility, and tend to use alot of energy weapons with say an auxillary ballistic or LRM strapped on if i can afford the tonnage, clan tech is just more suited to my tastes. That said, i have and still do play plenty of IS, so it isnt like i'm biased one way or the other, just that IS tends to go against the 2 major things, range and mobility, and im not quite willing to ruin my survivability on heavier mechs by using IS XL engines, which severely cuts my mobility given that im not gonna give up firepower entirely either way.
There may be a few mechs that are too powerful in certain configurations, but all in all, clan is better at certain things, and is is better at other things. ERSL aside (its OP), there is nothing about clan that is better across the board or vice versa.
The only category that clan utterly beats IS at and is overpowered in is aesthetics. I mean who here can honestly say a stream of blue shiny cLRMs doesnt make the ugly IS yellow blob launchers look terrible? That and i like the way their mech's look with less puke green all over, but some actual shiny bare metal too. Ofc the above is quite subjective, but i still think IS looks worse then clan.
Edited by panzer1b, 25 February 2016 - 03:54 PM.