Ok, here's why teaming with Snake (or maybe just Jesse) is good for Pit for those of you like AP who want it broken down.
Versatility:
Snake and Pit are both capable of CQC and camping. They are both good at holding stocks (Snake with his weight and Pit's planking capabilities). There aren't many team combinations that can outright beat Snake and Pit because they feed off of each other very well and cover each other's flaws. Pit can easily save Snake from being gimped or juggled with a few well placed arrows. If Pit is forced into a situation where he has to use WoI, Snake will be able to clear him for a landing with DACUS and tilts.
The stage choice is limited only to the players' specific likes and dislikes. Though it would be wiser to stick with stages that Pit can fly under if he needs to, Snake should be able to make sure you aren't easily gimped. Team combinations are limited only to the players' creativity because Snake's tilts leave lots of opportunities for follow ups from Pit. Tech chasing is amazing in 2 vs. 1 situations because Pit can wait in that one spot that Snake wouldn't be able to get to and punish accordingly. One of my favorite things to do when teaming with Snake is to have him put the C4 on me and go ham on our opponents.
KO Potential:
We all know too well the KO power behind Snake's infamous Utilt. Where Pit's KO options can be limited sometimes depending on how the match is going, Snake can cover that easily with his Utilt, Uair, Bair (seriously, that hitbox is crazy), C4, and occasionally grenades. Snake has the power to kill at higher percents, and Pit's arrows and mirror shield give us opportunities for gimping for early leads.
Damage Racking
Snake: Ftiltftiltftiltftiltftiltutilt. Ggs.
No, but seriously. Snake's tilts and grenades alone can rack up a good deal of damage. Couple the already irritating tilts with an untouchable Pit on the ledge firing arrows at someone and you're dealing with a pretty sizable amount of damage here. While Snake would be the primary contributer, Pit can always dart in and assist before going back to doing what he does best.
Idk guys, maybe I'm biased on the whole Snake + Pit teaming thing but I just spent a good amount of time listing a ton of pros for that team. I'm sure if I missed anything, Jesse or Kuro would be happy to fill in the blanks. For those who need visuals, here's the link to me and Jesse teaming for the first time.
http://www.youtube.com/watch?v=TkooDdhJePs
/rant over