I agree about Necropolis, it is classic Gygax, tear em up and spit out the chunks. If you want an adventure to brag about surviving despite its many arbitrary death traps and death encounters, it is a module right up your alley. Otherwise, to make it playable, you'll need to ignore a lot of traps and a few encounters. There is so much happening in Necropolis the players won't notice what you delete.
Rappan Athuk, the "Reloaded" version is coming out, so wait until it comes out to buy it, unless you want to buy the pdf's on drivethrurpg. It is a very deadly module series, so if your a group who doesn't like PC death's, don't play it. If you like a module that nails you for being stupid, not adventuring as a team, and not knowing when to run, then you'll probably love it. Plus there is a lot of room for a DM to add things, from encounters to story ideas to tie the module together even better.
LCoB rocks! But it!
CSIO rocks! Buy it!
Grey Citadel is fanatastic! If you want a module with a nice mix of fighting and investigation you will really like this one. It is one of my 5 favorites.
Bonegarden, Lamentation of Thieves, and several other Necromancer modules by Lance Havermale (who also has a fair number of adventures published in pre-3E Dungeon Magazine) are all based in Hawkmoon. A setting you can easily insert into a region of a campaign world. They are all good modules, the only thing that ever bothers me about Lances modules is there are some things that slipped through editing that show 3E is not his favored version of D&D. But the plots are good, and he uses some good DMing mechanics that some DM's will find very useful.
Basically, I own everything Necromancer has made, because they suite my style of DMing and playing. There are "problems" with a fair number of the products, but the more recently they were made the fewer the problems they had, generally speaking. The bottom line for me is that the advenures are solid, easy for me to alter for my campaigns, and most important of all, fun for me and my players to play through.
I didn't like the Maze series, the maps are useful, but others have found them (the adventures) enjoyable.
So here is a list of Necromancer modules I would run again in a heart beat:
LCoB
Grey Citadel
Morrick Mansion
Hall of the Rainbow Mage
Tomb of Abysthor
Rappan Athuk 1 and 2 (never got to run 3, but I would!)
CSIO
Crucible of Freya (with the Amulet download and the other download)
Frankly, I would use anything by Necromancer, but these are the only modules I have even had the time to run, and I would happily use them again.
Ones I am eagerly awaiting a chance to use:
Bonegarden
Trouble at Durbenford
Caverns of Thracia
Mesopotamia (combination sourcebook and adventures)
Again, I am happy to own everything Necromancer has done, but not everything they have done will be to everyones "tastes".
To make it easier older (3.0) material is on sale at stiggybaby for 50% off. Of course they are sold out of RA 3, ToA, and a couple of others. Newer stuff is discounted 20 to 30%. I have done business with stiggy for 3 years now and have had 100% satisfaction the whole time. I know of others who had problems, but they were fixed, quickly.