Perhaps, but it still had a few advantages over vanilla XP, such as stability, since it was pretty much a desktop version of 64 Bit Server 2003, and it allowed us to use 4GB for the first time, plus games and most apps were quicker than in 32Bit XP. I think that could be argued however because some were definitely faster and a few were slower but overall, there was not THAT much in it. Saying that, there is not THAT much between XP and Windows 8 in every game out there, bar a select few.
But for me... Once I got into XP64, I simply could not go back to XP32 because the entire experience was really quite different.
The only real issues I had personally was
PageDeFrag - I love this little app and it only worked on 32Bit XP ( and Win2K )
O&O DeFrag - So, Idownloaded the 64Bit instead ( Big deal )
Partition Magic - So, I then opted for Acronis but now use Partition Wizard
Other than that, 100% of the software I use, was compatible.
Obscure of not - it was, and still is a superior option to basic XP
Oh, and themes and apps like that were also poo but I dont use them.