Nah, a lot of the clan's stock loadouts are really strong.
I've run the Timber Wolf in stock config and can rack up 5 kills with ease. But that mech feels like I've enabled god mode at times. It's going to be gross for non-payers, when they cost 20+ million a piece. The grind was my main reason for buying the Clan Pack.
The Timber Wolf Prime is not a fair comparison, it is one of the best mechs in the Battletech, be it the tabletop or computer games. It is fast, heavily armored, good firepower. Its only issue is pretty much the limited LRM ammo, i think.
It ain't going to cost 20+ million (canonical price is around 25 million if i recall correctly). The Summoner is supposed to be 21 million or so, but in the game (as revealed by MC prices and a glitch) is about 15 million. Given that the Timber Wolf is mere 5 tons heavier, it ain't going to cost much more despite the Endo-Steel and more equipment. Perhaps 18 million? Still expensive, of course.
Personally i don't find there much point in buying the Clan packs... if all the mechs you gained had 30% C-bill/XP bonus (ie they'd be heroes like the Collection Primes are), they might be worth it. Pretty sure you only get one Prime per type of mech and the rest are basic types, as general rule buying normal mechs for MC/real money is not wise.
The paints and other stuff increase the pack's value of course, but i don't care about them at all, not bothering with visual customization.
These, and the fact i don't really see this game being worth any more of my money, i paid $30 for the Founder Veteran pack but given how the game has turned out, i'm regretting that (not regretting the tier itself, none of the Founder's mechs appealed to me). My premium time is still there unused... (If the game were in a state where i could see myself playing everyday for a month, i would activate it.)
If they get their shit together, release CW that works, with all "modules" (seriously, they're just releasing part of the thing at first), get the balancing to some reasonable state (the Clans must feel different from the IS but not be too much better really, the ECM must be overhauled, etc.), add more maps and modes, i might spend some more money on this later. But i don't think that will happen anytime soon.
Guess this is pretty good game for a free game though, and this is relatively fun despite all the issues, which is more than i can say about many other games these days.
And this isn't really "pay to win", so that's an added bonus, this requires enough skill that advanced equipment, heroes and stuff doesn't win this alone, or confer a big advantage either. Unless we define "pay to win" to include in-game money (C-bills)
EDIT Kit Fox build. Torso ballistic... uh, not a fan, not unless it is AC20 like the Hunchback has.... Might try it out though.