Looks hungry and maybe overwatered? You don't want it to totally dry out, but you don't want to water too much either. Stick your finger in the soil and see if it is dry or wet down a couple of inches before deciding whether to water.

a pic of the yellow spots

One of the things I'm doing this year is interplanting basil with melons and squash. The melon and squash vines just grow all around the basil, which grows well above them, but the roots don't really share any soil. So while the basil produces just a smidgen of shade on the vines below, it's otherwise wholly independent. I can load up N fertilizer on the basil without overloading the melons and squash. This is in a bed that gets 100% sun, so a bit of shade is no bother. I never bother planting new basil. I just continually harvest from individual plants, and they just keep churning out more. But I'd better stop talking about basil in a tomato thread.

I've had the same experience with tomatoes in containers - they have never done well for me. I've never had good results with store bought plants either. There are some smaller varieties bred esp. for growing in containers, but I've never tried any - yet. The bugs look rather like a fresh batch of just-hatched armyworms - tho they're usually found on the undersides of leaves. I try to be very vigilant about eradicating those, because if even 1 or 2 get away, they can do a lot of damage - they eat almost every kind of plant. As for the brown edges, it's hard to say, but I understand wood (& oak leaves too) makes a poor mulch for veggies because it encourages bacterial diseases. I use hay and grass clippings. Spoiled hay is the best. I buy a bale from a local feed store and leave it out to spoil. It seems to prevent diseases.