About the TACA service levels, I've heard the most diverse things; from people who say that they're the most marvelous airline in the world
to traveller who think it's more like a bad intra-municipal bus company.
It all depends on the personal experience you have with them. BUT, that shows only one thing: that they have a very inconsistent service. Travelling with them is more like a lottery on whether you get good or bad treatment.
One thing is that they are one of the youngest fleet in the Americas and that their network is growing pretty fast. Recently they added an all brand-new A319 from BOG
and currently operate 2xdaily A320 from BOG