I am going to game 3 tomorrow in Ottawa, does anybody here went before ? How's traffic ? Is it better to park downtown and head there by bus or by car is still fine ?
Are you leaving from Montreal on gameday or are spending the night in Ottawa?
The arena is located in Kanata which is the Western portion of the city, whereas I live in the Eastern portion. Speaking from experience, traffic can be pretty rough towards the arena driving on the Queensway, especially on weekdays when people are heading home from work. However, given that the game takes place during the weekend, I wouldn't worry about the traffic.
Parking is expensive but still cheaper than it is at the Bell Centre, and more convenient.
OC Transpo offers game day buses to the CTC via routes 401 to 406, depending on your location. These are not a bad option as the buses have their own designated lane on the Queensway and are therefore not affected by traffic.
Personally, if I was you, I would drive to the CTC but if you wish to save some money and time, and if you are driving from Montreal, you can park at a so-called "Park and Ride" (for free) and take the bus from there all the way to the CTC and back. If you are driving from Montreal, your best option would be to park at the Trim Station "Park and Ride" which is in Orleans and nearest to Montreal, and then hop onto the 405 until last stop.
It's better and more convenient to park at Trim Station than downtown because it's free and you are guaranteed a parking space (the lot is huge).
P.S. Do not listen to the Senators fans because they are providing you with false information.