yeah, i'm not blaming you. we got outplayed hard, and rumble's definitely more DPS than tank.
as for runes, i bought t2 stuff and then used the combiner to get several t3 runes i needed. it worked out ok. i've got a full set of flat magic oenetration reds, flat AR and flat M/5 yellows, scaling MR and flat CDR blues, and flat health and flat cooldown quints. working on the last one or two that i need there, then i'm getting some ArP and ability power runes (for when i play AD carries and AP carries, respectively).