If there is anything less helpful to people experiencing problems than the juvenile, snotty, "My [whatever] is fine. lulz," response, it's not coming to mind at the moment. People aren't making their complaints up. Do you jokers go to medical forums and burp, "I feel fine. You can't be sick," too?
Last weekend I was about to hurl my N7 (received 7/2012) off the 14th floor balcony of my hotel as it would refuse to respond to touches, apps would freeze, and it generally ran like a pig. It's been VERY slow to charge (more in a moment) and generally sucking AND blowing. This was a tablet that people used to oooh and ahhh at for it's slick greased grease performance. It ran fine with 4.1.2, but 4.2.x has always been problematic; currently on 4.2.2. with faux123's mainline kernel, loaded in hopes of fixing problems to little effect. Right before 4.2.2 was released, I was so sick of the lag in 4.2.1 that I reverted to 4.1.2. and while I missed the later version's features, it was slick as the day I bought it.
Doing some research I discovered that when it gets to less than 3GB free space, it can bog down. So I deleted the Game Informer app and it's porky 400+MB issues, Next Issue (which sucks on Android compared to iOS), and weeded out the ancient back issues Play Magazine was hording. Then I ran LagFix Free to ensure TRIM was set and Forever Gone (SD Card Cleaner) to overwrite and clear every free block. (The last took easily an hour to fill ~7GB space.) After these actions, it's not a total disaster, but it's still exhibiting stuttering on the home screens and in browser scrolling. I've cleared the Cache and Dalvik in recovery as well. I've run AndroBench and it appears to be fast enough.
More problematic is the tendency (I think) of Bejewled Blitz to cause an AudioOut_2 wakelock which will drink the battery down if you don't go and manually force close it (I have an End All Processes widget from System Panel I run after a session) and today a awoke to find my N7 dead when it was fully charged last night and at 85% when I turned in. It has been charging for six hours now and is at 62% charge, so that bug appears to be in play as well. (The same chargers will fuel my Nexus 4 from empty in 3 hours.) This is my go everywhere tablet, but it's getting to be a drag and inconvenient.
I'm monitoring battery drains with GSam and can't spot any obvious vampires. I don't have any auto-refreshing widgets like time/date/weather - just the analog clock. OTOH, I've got all sorts of crap on my N4 (running faux's kernel) and I get great battery life. Not sure what the N7's problem is, but there's a problem. I've also disabled Currents entirely; I use other RSS readers.