Heh, didn't realized the Predator is better. Changing it now....(wish I had a better pistol... ).
And in power-exclusive builds, nothing short of +200% is overrated IMO. That's your juice, after all. In mixed builds or weapon-exclusive ones, I'd agree with that.
Depends on what you mean by "better pistol". If you have DLC weapons packs you have access to some crazy good pistols like the Executioner. Acolyte is good for removing those "pesky" shields since it has a stupid-good damage modifier against shields.
As for +200% on power-centric builds:
1) If you are an Adept, +200% is overrated. You can detonate biotics as long as they are stilled primed by a biotic. Biotics generally last a fairly long time and as an Adept you have Throw which has such a rapid cooldown already. Even at +100% weapon weight, Throw will still have a sub-2.0 second cooldown. All of your basic primers (Singularity, Pull, and Warp) all have durations much longer than 2.0 seconds. Note that Pull and Singularity will also have about 2.0 second cooldowns at +100% as well.
And if you are bringing Liara and Javik with you, then you may be using their Singularity and Pull/Slam a lot meaning you are sill using only Throw anyway.
2) Tech-based (and combat/ammo combos) are more depending on keeping cooldowns short. Even then, most tech primers will last about 3 seconds, meaning you can let your weapon weight drop to +150% and still have about 3-second cooldowns on most of your tech powers like Overload and Incinerate and Sabotage, enough to still detonate. Cryo Blast is like most biotics, where its priming duration is based on how long its effect lasts on an enemy.
Now if you take a defensive power such as Fortification and still want to combo, then you have to compensate accordingly, in which case you will need +200 to +170% depending on how you spec it. You can also compensate or adjust that value if you use armor with Power Recharge Speed bonuses. Some Intel can also grant you recharge speed bonuses giving you some more % to play around with.