Warhammer 40k Tabletop IX: "Mech is king? I never voted for it."

[Tazar]

Because Crisis Suits and Broadsides/Hammerheads are damn good units.

This also avoids the problem of having too many tanks feeding KPs with their gun drone passengers (fix that already, GW!)

I'd put Guard top tier; it's got some bad options, but dear Lord is it a strong book. Placing it under SW and Blood Angels doesn't really seem fair; the majority of stuff in the Guard book is very, very strong. You can't really go wrong building a Guard list, either.