Diminisher is only good for boss/uber npcs with group. Because normal npcs lose their sheild very quickly including tallon if you are not flax noob. And not very efficient to use it's ability if not a lot of people shooting same npc in a group. Nice to bash cubikons too ...
Venom ability is very useful for running tallons, boss talins. Just damage them until they run and immidiently use venom skill and forget it. You will get your reward very soon

If a venom could be with diminisher, and both use their skills same time, npcs gonna have a really bad time.
Spectrum is a noobs savior ship. %80 of laser dmg will be reduced while using its' skill.
Sentinel imo the best looking and worst FE ship in the game. Your shelids holds %30 more for only 10 second. Definetly not very usefull since skill duartion very short and not compansating its' cost. Think its' skill as you have %30 more sheilds for 10 seconds repeating in 30 sec.
Solace is good but not as good as ageis. Ageis can do everything solace does, and also can fill it's sheilds. But if you want a Goliath that is semi Aegis, than solace is here for you.