I love Tactical RPGs a la Final Fantasy Tactics, Disgaea, Tactics Ogre, and all the Nippon Ichi ones.

But of course I love all manner of RPGs, puzzle games, fighting games, sidescrollers, etc.

This is easy

1. One Must Fall: 2097

2. Jazz Jackrabbit

3. Fallout 1/2/Tactics

4. UN Squadron

5. Doom 1/2

Some guy earlier said he thought the depth was disappearring from from games today, and that he prefers older games... Let me ask him a question...  What depth is in Mario 3 that wasn't in Super Mario World?  What depth was in Neverwinter Nights that hasn't come standard in virtually every new RPG for the computer in the last 3 years? I'm glad you put Final Fantasy 6 before 7 on your list, but I found 7 to be subpar.

Also, some Zelda fanboy also said "OOT, nothing else compares".  I think OOT is a great game, but it hasn't aged well, and there have been dozens of games to surpass it if you can get past the fact that OOT was simply one of the first of its kind.  I promise, that will mean nothing to the newer generation of gamers who will see God of War and its ilk as the new "nothing else compares" type of game. So consider that.

I respect nostalgia, but I think you should realize that this is all you feel when you play these games. There's nothing special about them anymore.