Me personally I think bombers are a tad strong, but in a good place overall.
My major grip with them is their inconsistency with dropping and the semi-skill semi-rng ground fire&engi dodge mechanic we currently have. Micro is important, but for the same reason I hate a lab outmicroing a tank to kill an engi afterwards, I hate having an engi perma dodge a bomber for 30 seconds until an inti arrives. Having to guess groundfire locations is stupid and unpredictable. IMO the early game should not be prone to as much randomness as it currently has with unit interactions.
I would love for some consistent interaction with how bombers do damage. Can further balance afterwards.