B'cause everything else I just adore, especially the things I wrote in the DD Love thread...
1. Resist Stacking. No matter what you play you're always better off with resist stacking. Some dungeons (VGT for example) practically require you to max resists. But even those that don't (Labyrinth + VT, Naga City + VT, most Vicious in general) are just plain easy if you stack resists. To summarize: I kind of hate how resist stacking is, like, the Joker in the pack, no matter what you play, no matter how hard the dungeon is, if you stack resists, you've mostly won. I go out of my way to score Vicious+VT wins with no resist chars, and it's non-trivial. Resistances are the single most important factor to melee - significantly more important than damage or health or anything else.
2. Vicious Token. I'm actually mixed on this one. I love how it has a "new game+"-esque feature, allowing the replay of lower-difficulty dungeons with a bit more increased challenge. But it distorts stats, meaning that often you'll have different strategies dominating non-VT and VT. i.e. you may have a lot of leeway playing a striker/caster in non-VT, but in VT it's almost invariably brawlers (and, you guessed it, resist stacking!). Kudos to Lujo for going all VT in his new profile with random stuff, though I'm probably farther behind in the learning curve to even fully grasp all the nuances...
3. Astral posted VGT Goat vic. Kind of, it's not actually Astral or the posting, maybe in general the fact that since by now we know that everything that is winnable in DD has been won, there is very little pioneering left to be done. Sure, we can fool around refuting proven strategies and trying to win things in new ways, which is always fun, but there's always the thing about figuring out stuff, which is arguably the best aspect of DD. I half wish I never stumbled upon the forums (curses on you Darvin! j/k), because beforehand I had to figure out everything for myself, and I was proud like a ninja squirrel when I scored my first Vicious or VGT victories. Now it's more "meh" and all, despite the class-A crew posting and encouraging players here.