@D4m0R3d yeah in reality when doing an actual basic combo you on really get about a 1-2 sec off your cooldowns in the average team fight. That's if you land about 1 - 2 full combos.
in saying that, having CDR in a game based around abilities is pretty powerful and knowing that you can rapidly reduce your ability CD when your team is backing you up is amazing. its the base of all my builds atm.
My main build is In the zone, love thy self & spread the love. So can spam the healthy ability.
I was doing some testing with the "in the zone" mod which reduces your cooldowns but 0.15sec for each successful basic attack. If you hold to extend your slaps each small slap is counted as a "basic attack". After my testing, this essentially halves all your cooldowns.
Shoulder Charge: 14s CD > 6-7s CD with mod
Speed/Heal Boost: 12s CD > 5s CD with mod
Boop/Step-off: 11s CD > 4-5s CD with mod
Now the negative to this is that you're almost stationary when doing a continuous slap so standing in the middle of a team fight holding slap probably isn't a good idea (unless you're being pocketed). But weaving in extended slaps into your combos when you have this mod equipped will make you significantly more sustainable.
Note: this also appears to work for each hit on your extended uppercut at the end of a combo.
@AmazingVector Had a read through your revised tier list, although I am sad Makutu is at the bottom I do agree with your points. Pretty happy with this as an overall initial outlook on the state of the heroes from beta. 
payload delivery like overwatch/paladins would also be fun.
I do agree that the healers feel "overpowered" when you are going into a team fight as they can out heal a "brute force" approach to an engagement. I think BE is more about the effective use of abilities over "I want to keep damaging this thing till it dies". Maybe your approach was too linear?
It would be interesting to see some approaches that shorten team fight times or overall TTK.
I don't think nerfing everyone into the ground will solve the problem.
It would be nice to be able to move and parry. idk if I would call this broken though ...hard to master maybe?
I also posted some damage numbers and combos I was testing for Makutu over on this thread: https://www.bleedingedge.com/forums/topic/550/makutu-combos/4
just an fyi. 
@BLAZ3-Major I am on board with you here. There seems to be a lot of surface-level hate for ol'boy Makutu. I clocked up around 10 hours with Makutu during the beta and tank in all of the competitive pvp games I play, so I feel I can chime in here.
I think when compared to the other tanks Makutu doesn't tank in the same way. He is not a dive in and assassinate type of tank like El'bastardo or a positioning punish like Buttercup. Makutu is a disrupt tank, very similar to Winston or Hammond in overwatch.
I think there are a few key things that need to be understood when it comes to tanking before we discuss the "effectiveness" of a tank. The primary objective of a tank is to "create space", by create space I mean creating an opportunity to deal damage or create physical space for a team to move onto an objective. They can do this by mitigating damage and/or drawing attention from the enemy team.
So the key criteria for a useful tank are typically:
So with this in methodology in mind and some criteria to measure tank effectiveness against I think these points should be considered when ranking the tanks in the overall tier list
Makutu
High sustain - 5/5
Disrupt - 4/5
Escape/Engage - 2/5
Makutu, imo has the highest sustain without a support (only second to El'Bastardo, depending on skill). His ability to disrupt falls onto his shoulder charge and "boop" abilities, on the surface these seem useless or trivial but when used with the goal of creating space these are some of the strongest abilities in the game. He does fall short when it comes to his escape and is reliant on his speed boost and should charge.
Key mods: Cooldown on hit, increased heal burst, increased self-heal, 3 sec slow to players hit by "boop"
Buttercup
High sustain - 2/5
Disrupt - 5/5
Escape/Engage - 4/5
Buttercup on her own actually has very poor sustain and all of her threat and space creation comes in the form of constant damage. Her strongest utilities are her "hook/yank" and AOE slow. She speed boost is a great escape and she can charge people when coming off her mount.
Key mods: ??? (need some input here)
p.s: not too much experience with buttercup, would love someone with more experience to add to this.
El'Bastardo
High sustain - 5/5
Disrupt - 3/5
Escape/Engage - 1/5
El'bastardo has amazing sustain and in some cases pretty much unkillable when your time is abilities well. He doesn't have too much in the way of disrupting the enemy besides his stun on leap and this goes for escape and engage once you have used your leap your pretty much YOLO commenting into a fight.
Key mods: ??? (need some input here)
p.s: not too much experience with El'b, would love someone with more experience to add to this.
Thats my two sents, I love these conversations would love to hear others opinions or chat more about this.
100% a Makutu main, Got in like 10 hours with him during the beta.