Tactics is good,
provided you install the correct components. Many different modders contributed to the Tactics mod, and even when two components were written by the same person, they are often wildly different in terms of difficulty and quality. Go
here and read the One-Minute Reviews (just scroll down) for my review on each component. That review is a little old, so some of the components, such as Improved Ilyich, have been made more balanced and believable.
The components that have been added since I wrote that Review are:
Improved Druid Grove: B+. Makes the Grove nicely challenging, but there are still some Weimerization issues, such as Druids with permanent, non-dispellable buffs. Plus there's the fact that Improved Faldorn is almost literally unkillable (just delete faldorn01.cre from your Override folder and you'll be ok).
Improved Fire Giants: F. In approximately 1.5 rounds, a single Fire Giant will cast Lower Fire Resistance (area of effect, of course)
four times, Summon Fire Elemental, and Fire Storm. None of these spells impair the Giant's fighting ability, of course, so he'll be pounding away on you at Improved Haste speed the entire time.