Just did that. Although I only bought Theme hospital and DK2.
Can anyone confirm the awesomeness of this bundle?
That one's kind of an edge case for me, since I already own Pharaoh, Lords of Magic, and Lords of the Realm II somewhere, and Caesar III is basically just Pharaoh, more or less, as far as I've been able to tell. Having them discless and more assured to work on a newer machine than normal might be worth considering, I suppose.
As for what I do know, Pharaoh is a city-building game, largely based around housing values and disaster mitigation. Citizens need food and luxuries and nice surroundings to advance to more lavish dwellings, and apothecaries and fire stations and so on to not die of plague or catch on fire. I'm not sure I can offer real advice on whether it's "good" or not.
Lords of Magic is one of those old, horribly balanced, but still interesting games. The kind of thing you really wish they made a sequel to. You manage your Lord, other heroes, and mundane units, as well as your kingdom, trying to clear out dungeons for loot, research spells for your mages to cast, defend your realm from marauders, and so on. Overland map to move on, combat map to fight on. Ranged units tend to be laughably strong, since getting hit causes a brief recoil that stops you from moving forward. All noncreature units gain experience, with heroes having a higher max level than troops. I can unabashedly say it's "good" as far as I'm concerned, but it is old and horribly balanced and so on, so, you know.
Lords of the Realm II is a province-managing/castle-building game. It's fairly simplistic, as I recall; you manage what food sources your peasants are using and set their tax rate, then use your funds to build castles and swordsmen and so on and attempt to conquer everyone else and become king. There's also stone and iron, I believe, as special resources in some provinces. I also don't know if I can provide a useful quality assessment here.
So, the short version is that I'd buy it if I didn't already own it all, but I can't say for certain if you should do the same.