WWF Smackdown! 2: Know Your Role:
I loved the structure and free-travel of their Hardcore/FCA matches I would take opponent into the locker room and throw him through the wall which opened up the bathroom and take a shower before beating him up again. Making opponents quit in I quit matches before the microphone even touches them. I also loved the PPV creation mode and ridiculously unreal deep CAW customization. I don't think THQ will ever touch that level of customization within their games again. SYM, SvR2006 and DoR came close though.
WWF Smackdown! Just Bring It:
Just the hilariously awesome commentary, I tried modding it into the newer games but it didn't work. I also remember how much space this game's save file took up smh. Still the only game to allow up to 8 players at once, thought at the time it would become a standard.
WWE Smackdown! Shut Your Mouth
Oh crap where to begin. Throwing people off titantrons, slamming people on exploding cars, riding the subway to Times Square, throwing snowballs at your opponents (during winter), and this is all in one match. An outlandish yet deep CAW mode complete with 5 CAT modes on top of huge roster. Creating a roster full of CAWs and forming your own promotion within the game's awesome season mode. Not to mention that the environment interactions in this game were ahead of its time and still is for a wrestling game. The only thing this game didn't have was exhibition title matches.
WWE Smackdown vs. RAW (OG):
Despite the shitty CAW system, this was a great game. I actually liked their implementation of the clean/dirty dynamic. The gameplay was a cross between HCTP and later WWE titles, easy to pickup and play yet still rewarding to master. This game also bought back Create-A-PPV complete with main event video packages which was fun as hell. I also enjoyed the season mode, lots of diversity within it and it flowed more smoothly here than it did in later titles.
WWE Smackdown vs. RAW 2006:
The models, graphics and overall presentation were and are still superb. The customization was nuts (talking CAW, CAB, Your Locker Room *though 07's is better*, The first CAE) Not to mention the long demanded return of exhibition title matches. The Gameplay here was largely retained from SvR-OG which is a plus however the stamina system fucking sucked hard glad it was an optional feature. They also had damn near every match type ever created up to that time period in the game.
*huff huff* got all that out of my system and I didn't even do the Gamecube games