Mars Prison was the best, I played that map almost exclusively on Assault so many times, Venice is another favourite of mine as well. I never really understood Cortez's catchphrase, the most I get out of it is the fact that it sounds corny, the conversation between the two Crows is probably my favourite part of the game though along with Cortez shouting "damnit" so loud that somehow Harry Tipper hears it back in the 60's (Or is that Janitor actually just a REALLY old Harry? I figured it could've gone either way). Strangely enough the bot AI in the TS series is good, really good, team mates actually have a positive impact and it makes me wonder how the hell games in recent years could **** up something like bot AI so badly.
As for TS4, I want it badly, they said they'll make it if there was a big enough demand for it, there's even a petition up online for it as well, I've obviously signed it at it's at something like 19,000 so far, so add the "dark figure" on top of that and I think there's enough fans out there to justify it being made, as long as they don't hold stuff back for DLC or make you buy online passes if you buy the game used, then things should be fine, though I'm not entirely sure how online multiplayer would pan out in this day and age, will it be matchmaking with the parameters for each gametype be fixed to a default like they are in Halo and COD with a custom games mode on the side, or will it be server based allowing the admin full control on parameters? Also, will there be bots or will they ditch them with the assumption that the online multiplayer will be popular enough to keep the game afloat for a few years (which would probably demand DLC)? That and whether they'll adopt the Halo "two weps and recharging health" system that is commonplace or stay old school are the only things that bug me about a potential sequel, mapmaking, would be cool, but I'll doubt that any major publisher would want it in a game in this day and age.