Genres eh. Big fan of the typical shonen. Once in awhile I'll have the urge for light hearted romance/comedy. But as for the series that enthrall me most are the dark, seinen, ones. Reading Berserk is like asking for a few days without sleep. And Dorohedoro was just amazing, crude art sometimes, but riveting story.
Oh and as for mech, depends on the show itself, mech is just kind of there. Gotta say, loved lots of Gundam series, Evangelion, Full Metal Panic.....although have never gotten into Gurran Laggan(spelling?).