melee champs are best on tt because of the tanky nature they have over the ranged conunter part. as for trynd, he has a very strong slow+debuff and a great chase with spin to win. he should not have ( or at least i dont) any problems chasing down people or starting fights. and if you let your oppenets get morg and mundo then your doing something very wrong to begin with. and again he adds power because of what he brings to the team.
you see him coming and have 2 options:
1. fight proly greatest carry in game (assumeing past lvl 6)
2. run and give ground.
if you see him in a team fight you have to kill him or let him kill you while you try to kill his to tank brothers, if you try to cc him, you proly got 1 hard and maybe 2 slows so a sash+cleanse will solve that. if you burn all the exhuast on him then great! he is such a threat you have to do what ever you can to kill him or cc him, opening up the gates for the 2 other guys on his team that you have been ignoreing.
you dont need a great farm with trynd to do well, a great farm just makes up for a lack of skill, you have have to hit for 700+damg on tt because your only trying to kill 3 people not 5
As I said earlier, spam heavy disable champions like nunu/xin/morg/annie are going to force out the cleanse early and spam a disable the next time it's up. And the ability to run away from a melee champ forces Tryn to either waste time chasing or swap targets which allows the person he was chasing to fire abilities off until Tryn's spin is up (or else he's stuck walking).
And as I said, any top team will likely either ignore Tryn while they crush his team as Tryn doesn't do any damage at full health unless he's been absurdly fed or just spam disables on him all fight, I don't recall the last time I've seen any champion crit for 700 damage in TT ever because most games end far before that much farm is achieved..