My last JB was on iOS6. What I noticed is that there is much less development than there was a few years ago, and barely a handful of remotely useful (IMO) applications.
I spent $5 on the only plausible attempt at predictive keyboard (a BB10 copy), but it was so poorly executed that it was pretty much unusable.
I wouldn't advise anyone to JB, unless you have specific requirements (maybe tethering, but why bother if you also have an Android, since most of them do it out of the box). Development on that side seems to have almost completely stalled (unless you want to pirate a bunch of outdated copies of mostly 99 cents apps).
With iOS7 Apple has finally implemented multitasking, which was the sore thumb of iOS, plus what is basically a new launcher, but it still needs to open up stuff like native keyboard to gain back users (yep, Apple's primitive keyboard is my biggest gripe right now - it is a complete joke compared to what's available on Android).
So, don't feel bad because some fanboy touts the wonders of JB, with a few rare exceptions, it's a pointless exercise.