How did it ruin it? I have ben told Jailbreaking carries a lot less risk on iOS than rooting does on Android.
The Jailbreaking process, and all that comes with it (at least for the last update my iPad was allowed to take, which I believe was iOS4 or 5) is an extremely weird thing. The
process is fine, usually being a one click deal. But actually utilizing it, particularly that Cydia, the Winterboard/Springboard, etc. is completely counter-intuitive and only made enjoying my device more troublesome. The Cydia market was, at that time, completely chaotic and with no logic or reason. So finding useful tools aside from the standard "Top 5 things to get!" lists is extremely difficult. On top of that, Jailbreaking is most similar to our rooting, so it's really only opening up a level of access. You can't change system images or make wholesale firmware changes (at least when I did it), so for me, I never really bought into it as a means to effectively master and control one's device.
I should have never done it. I used the iPad for Netflix, reading, and browsing. There's simply no need for it, but alas, here I am today.