[Motorola Droid 4] Jishkah:
4G/LTE performance on this phone is pretty draining. Sitting on Standby, I lose 15%-20% battery every hour. Actively using the phone, I lose a good 25%, maybe higher. 30%. 35%. Higher numbers aren't unusual, so if I need to preserve battery life for a while, I try to stick with 3G, since that doesn't seem to be too draining.

Truth be told, I haven't really seen anything like that. My WiFi performance on my phone is decent - swell, even. I could probably leave my phone unplugged through the night, connected to WiFi, and still have 40% battery by the time that I wake up. Not ideal, mind you, but decent. As it stands, I unplugged my phone from the charger at 100% about fifteen minutes ago, typing away at this with the phone since then, and I've lost 3% battery life within that time frame.

If I can suggest something radical, it could honestly be your battery. I remember, with my old battery, dropping suddenly from 40% battery life to 17%, 16%. It was kind of bonkers. I've since replaced the battery, and things are (mostly) fine... though I'm beginning to notice the same issue as time goes on. Usually drops suddenly from around 30% battery life to 19% battery life. I've just kind of accepted it as "Yeah, the Droid 4's life is terrible", but nothing that I would suspect is the ROM's fault. I've been having this issue since CyanogenMod 10, even.

In my (honestly uneducated) opinion, it sounds a lot like a battery problem. Have you experienced the battery issue since then? It could be that whatever's responsible for reading battery charge levels on the hardware level is reading incorrect values, so go ahead and see if the problem persists after a few charges.

...It's prettier? :|

You've got a point, I mean. As it stands, most of what's available in CyanogenMod 13 is available in CyanogenMod 11, albeit in a somewhat unrefined manner. I could probably go back to CyanogenMod 11 without any major changes as to how I use the phone, but I can definitely see where it is that you're coming from. Personally, I prefer CM13 over CM11, simply because it's more refined and not much more messy than CM11 was in the late stages of having the ROM installed, but your mileage may vary.

As it stands, outside of the (rather sudden and crippling) performance hits that CyanogenMod 13 suffers from, I've only really found one or two bugs - my phone has a hard time automatically connecting to saved WiFi networks, and it doesn't remember Bluetooth devices (it says that it does, but when I actually turn the device on, it seemingly treats it as a new device, SmartLock and all). Most of the performance hits seem to be Facebook being Facebook, Firefox being Firefox, 2016 apps being 2016 apps, and my phone jumping back and forth between 4G/LTE to 3G to suddenly forgetting how to phone and losing signal, entirely. It definitely seems like data handling is the worst of the performance offenders, effectively rendering my phone useless until it gets everything sorted back out and signal/data re-established properly - until then, everything crawls to a cripplingly slowdown until I stop touching it for a good five, ten minutes or so.

You've got a point about CyanogenMod 11, though. I'd personally recommend 13 over 11, simply because it's more refined and the performance hit isn't too drastic between ROMs, but if you heavily prefer something a tad bit less messy and prone to sudden failure, then there's really no reason to upgrade from 11 to 13.