Lethal land bombard is easy enough to disable in the editor. I did that a while ago. That's a trivial issue.
The pushed-back maps and communications trading is great on the face of it. The AI doesn't handle it too well, though, especially on island maps. I think communication trading should maybe be pushed back earlier, just for the AI. It's nice to explore and meet people, but the AI doesn't handle it the best.
Armies... Oh, armies. They're the biggest issue. They're like a drug. You know they're bad for you (errr...the game), but they're just so cool. You can't put them down. You can tell yourself this time it will be different, but.... I think some sort of modding is the best way to deal with those, but I've not taken that plunge yet. The AI just doesn't know what to do with large hp opponents. The thing is, that's always been true, but it wasn't as expoitive as with C3C.
The unit-giving wonders are fine. Yes, there's luck in Statue of Zeus. Yes, whoever builds it has a significant advantage. But, you know what? Building Pyramids or other things can give a marked advantage, too. And having one killer AI (which is much more prevalent in C3C than previous incarnations) does pose an additional interesting challenge for the late game. I don't find them broken, at least not for single-player play.
The improvements are nice. The FP change is good for the AI. Yes, it's a reduction in strategy, but it's not overwhelming. The fixes to corruption are absolutely essential. The Conquests themselves are fun, IMO, and a neat change from the epic game. Some (most?) have balance issues, but they alone were worth the price to me. But I'm an old fogie with a real job, so I have a different perspective on that than many here.
For me, it was definitely worth the money. YMMV, of course.
BTW, Doc, the other legitimate complaint I've heard is "This has been broken since vanilla...why didn't it get fixed?" (e.g., war weariness). Were it not for armies, the game would be harder, too...so it's probably harder, a bit, for a peaceful builder than earlier incarnations. <Shrug> I think harder is a good thing, so that doesn't bother me at all.
That's my take.
Arathorn