Went with Super Smash Bros. or in this case, "Other". The reason is quite simple, it's my favorite video game series of all-time (duh). Obviously this post (which will more than likely be quite long [probably expected though]) won't be a thesis on why Smash is the greatest but instead will be more why it's my favorite. As a matter of fact, I'm bored enough that I'm going to give my quick thoughts on every series brought up in the poll, as well as list my favorite (if any) entry from said series.
I'll try and breeze over Smash quickly, simply because it's hard to talk about it without gushing, especially with a new game on the horizon looking to be the best one yet. It's a fantastic fanservice game for one without being dependent on the fanservice. Granted, had they kept with the original build (with no Nintendo Mascots) it obviously wouldn't have reached the commercial success but I mean the gameplay stands on it's own. It literally took a fun game & then through in Nintendo characters in it & it developed over years only getting better with each installment (though, your mileage may vary). Allowing for a game that is a bunch of fun without the Nintendo roster but uses it's roster to enhance the experience into something special. Brawl, my favorite so far, has an outstanding roster (minus the removal of Mewtwo), fantastic stage selection & an incredible amount of modes, one of my favorites being Subspace Emissary. I got Brawl the day it launched & I kept playing it until about a month or two ago, when my Wii decide that gamecube controllers were the worst thing everything, & it was a similar deal with Melee (minus that gamecube controller part). & that says it all for me, the fact that most entries kept me playing until the sequel came out (& this is series where sequels are 6-7 years apart). Most games can't even keep my attention for a year.
I had initially intended to write up about all the other series (evidenced by my earlier remarks about how I was going to do that [would've been a lot less redundant had I just deleted that line]). Started Legend of Zelda when I realized this was getting too long (altogether, it was about 700-800 words, since I reached approximately 650 with Sonic) so instead I'll just list my favorite game out each franchise.
Mario ~ Super Mario World. The All-Stars version where Luigi has his own sprites (in which he coughs up fireballs).
Pokémon ~ Silver.
GTA ~ N/A, not really a fan of sandbox games so I never spent much time with the series.
Metal Gear ~ Snake Eater.
Sonic the Hedgehog ~ Sonic Adventure 2 Battle.
Final Fantasy ~ Tactics
Call of Duty ~ N/A, first person shooters are perhaps my least favorite genre & the one game of this I played (don't even know what it was) wasn't any fun.
Mass Effect ~ 2.
Legend of Zelda ~ Majora's Mask.
Donkey Kong ~ Country.
Halo ~ 2. Less about the game & more about the memories of playing it with friends & family but I do like the Halo series more than most FPS's.
Tomb Raider ~ ?. I don't know the title but some co-operative game my brother has on his 360.
Batman ~ Arkham City.