Klingons technically are weaker than Feds... and I play a Fed... one vs one a Fed will generally beat a klingon... the reasons:
Fed has more consoles and more BO skills to utilise... Klingons are more limited only to tactical BO skills.
The only thing going for them are their cloaks... and ONLY BoP have battle cloaks. (at least in tier 2 I haven't checked the other tiers).
It's the initial surprise that really screws up a Fed.... after that... everything is about even.
Now with the nerf to MES... things got alot more even handed.... and THANK YOU DEV for changing MES.
We are not limited to Tactical BO skills. I think you need to roll a Klink and find out. We do have a number of sacrifices, our ships have less hull and shields than Fed ships BoP's have fewer BO slots and less hull and shields than any other ships in the game, but Klinks really is the thinking mans faction, when thought out and played well they are devastating.