I have to admit, Linkara's review on Thunderstrike reminded me that i used to have some fondness for Tom Defalco and Ron Frenz's run on the Mighty Thor series when i was a kid. I say it is as good as Simonson's even, but for very different reasons. I had a few random issues from earlier, but I picked up #400 when it came out (back when giant-sized anniversary issues contained actually worthwhile bonus goodies; and the same time as Cap 350 and Avengers 300- what an intro pack period!). Eventually I had everything DeFalco and Frenz Thor-related, annuals and all. I've said before Wally West and Kyle Rayner under certain creators were DC's Peter Parker, but Defalco run of Thor felt like Marvel's Superman. And I know DeFalco isn't for everyone, even back then, he aped the stories of Lee and Kirby to the point of having a cheesy dramatic narration, but I liked how in his reign as Ed in Cheese the FF and Thor were off limits, because they were his.
DeFalco lost me when he brought in Thunderstrike, but everything before that I loved. The Celestials story, the big Seth storyline with that issue 400 already mentioned, the Black Galaxy story with Stellaris and the High Evolutionary, Code: Blue, the drama with Eric's family, all the stuff with bonding Thor to Eric a la classic Don Blake stuff, and especially the last few issues pre-Eric fully taking over ("Requiem for a Wrecker" and the huge Thor vs. Loki double-sized "death" issue") were great fun comics.