first off, before i start the review part of this, i would like to say that i do play cs:s and therefor must say i will be as unbiased as possible for an avid player.
Background:
Nov 1, 2004, Counter strike source is released by Valve, and is also able to be bought on steam, much like the predecessor. Counter strike 1.6, the game that many people believe is the height of the series that goes all the way back to cs:beta.
Game play:
Game play is usually smooth, you will get your standard fps lag every once in a while depending on settings, server quality, and your own connection. The system of registration is effective, but you can have times where a shot will not register and the person will have a bullet in their brain and live, to shoot you.
The controls:
The controls are completely customizable, the standard controls are easy to use after an hour or so, and you then can start to understand the more complex controls.
Communication:
The game allows for voice communication, for all you people who play XBL you will know that this leads to small children, disrespect, and much swearing. But you may disable all talking or just mute the avidly annoying, and the small child factor is standard to all games with mic use available. Also standard is the common team and all chat that helps if you dont have a mic, or are just not wanting to use it.
The place of playing:
Servers, there are anywhere from 1 to a million of these, and they can be created as dedicated servers, or bought through GSPs (game server providers) these cost money to keep up. selecting one is as easy as it can be, you click the join server button on the start screen, then search using the filter, or just randomly until you find one you want to play then you just click it. The main point of having so many servers, is the level of customization that can be done, this is where the game shines highest.
Game types:
you have the standard reg. css where you shoot kill and own noobs
zombie mod, where you barricade your self and friends and try and kill the zombie that spawns in about 30 seconds after the beginning of the round.
Gun Game, where you must get (at least) one kill with every gun, then a nade kill, and finally a knife kill to win the game.
Zombie escape, you try and get to the end point and set off the nuke/toxic gas/world ending thing that kills all the people not in the safe zone.
bhop, trying to do linked jumps to get around and through obstacles
death run, where you try and get through traps that the opposite team sets off trying to kill you.
hosties/jailbreak, two nearly the same mods with slightly different rules, where one team is the jailers, and one team is the convicts, and the last two or one convict gets to play a game of their choice (last request). The jailers give orders, and kill those not following, and the convicts try and rebel against them.
trikz, you try and put all your skills from bhop and other types of places, to do trilz to get around obstacles, this is said to be the hardest mod in the game
there are many more, that i will not go into depth on, and every day there is new ones, such as soccer, paintball, machine vs. assassins, hide and seek, and more.
Competitive:
before the death of cal (cyber-amateur athletic league) and the CGS (championship gaming series) the level of competition in Counter-strike source was very high, at all levels of skill (these were for reg. css only). Now the only main steam league is CEVO (cyberevolution)
http://www.cevo.com/
Off game things of importance:
CLANS
well as many of you know what a clan is i will not waste the time putting that, but there are so many clans it explains mainly why there are so many servers, because once a clan gets popular they expand by getting more servers, such as some of the top clans can have up to 40 servers, FULLY POPULATED, up to 60 slots!!! Smaller clans may be based around one aspect such as some clans may be gun game oriented, such as
http://devestation-gaming.forumotion.net
finally:
i would just like to say that this game is at its basic roots, a good game, yet once it hits the customized items, and the level of out of game support, and constant making of new and better game types that really makes this game a huge success.
VERDICT: for 20$ i say buy it and do it now. You will regret it if you don't.
edit: as this is my 1st review feedback would be lovely indeed