They do not suck.
The silenced rifle is a pretty great power weapon. It's like the assault rifle (which is free for everyone) except that it's silent, so you wont show up on radar.
The Enforcer is also pretty powerful from what I gather (I have not used it in a long time so I can't recall. Just going by people's impressions on this one).
There are preset loadouts which give you access to use all the new DLC, but you cannot make your own. On the plus side, ND removed the Level 3 versions of some of these new boosters and combined them into the level 2 versions, which are accessible in the preset loadouts. Basically, the preset loadouts give you access to the paywall content at its best form.
Still, it's a dumb thing to do, because it is not cosmetic, meaning you screw the player balance from day one, regardless of how insignificant you may think it is. For example, the assault rifle is a pretty good power weapon to use, but the silenced auto rifle for the most part does the same job with the added benefit of remaining off the radar. This is a good advantage to have, but you seemingly must pay for it.
It is not pay to win. It is not significant enough or disadvantageous enough to be pay to win. However, surely, some rounds will be won by the fact that some have the freedom to customize their own loadout to have the playstyle they want, while others don't.
It should have been free, and that's the bottom line. If they wanted to nickel and dime us, they could have charged for more class loadout slots and a variety of taunts and cosmetics. But once it affects gameplay even in the slightest, it affects everyone.