Should you feel guilty about liking them? That's up to you OP and I think you've already made up your mind about that.
However BW should feel ashamed of making such horrid outfits. Samura, Jack, Miranda, Jacob, Thane, EDI, Kasumi, and go go dancer Ashley all have major flaws to their outfits that are unrealistic, immersion breaking, irritates, offends, and is just plain cliche when one is dealing with battle, zero Gs, and plauges. BW should've never made these outfits as their standard 1st impression outfits its like if Shep showed up in their colony mining bibs from the start of every ME game we'd never take him/her seriously as a space commander BW does the samething here once everyone gets ready for battle this game isn't final fantasy it is however wanting to be a serious space drama but these impression outfits ruin it either at the first introductions (samara, jack,) or once the planned battles begin (miranda, jacob).
Lets break this down shall we:
Miranda and Jacob - these outfits are fine for pencil pushers but they are unrealistic how many of us go to work in such form fitting wear? But it can still get a pass based on these guys weren't on the front lines and didn't expect to get shot at in their own base. However Miranda should've doned armor and got rid of the heels for ground missons or not be allowed to be on ground crew. Jacob needed armor as the head of the armory you think he'd know this.
Thane and Kasumi - Our space Assassins works fine for their inital jobs but again we've got zero G's and bullets get armor, or state that they're wearing vest under their clothing. Thane at least has a medical condition which allows for the lee way but that makes the reason for why we couldn't have gotten a healther assassin for the mission questionable and for another thread.
Samara - our space Samurai/Jedi worse outfit for her job expectations sure Asari are suppose to be sexy but she was a walking excuse for more sex appeal it was unnessisary we have great concept art of the same armor in practical form so there was no excuse to change it to this life ending choice. And hospital masks? Really BW for all the characters who untilize them they should all explode and die ALL OF THEM!
Ash - back in ME she was right on ready for battle and even in her off duty she was spot on for a millitary vessel. I got it, this isn't a millitary op anymore so she can relaxy a bit but the boots the battle skirt? Got to go, she needs her life saved not try to impress her enemies with an imprompto fashion show here.
Jack - Our resident physco again why she's even on the team is debatable for so many reasons and another thread but give me a reson why she's in a bra strap? What was she doing when she was caught? Have her complain about it so I know where she was caught so I can go Ok I get it! However her rough life leads me to belive she'd want more clothing not less but with no ingame reason for the attire and a perfectly good alternative in the DLC why didn't she come in her leather vest first? That was bad girl but still allowed some play for I get in knife fights sure BW said tattoos was why we got a strap but I'm going to need more then that lame excuse.
Bottom line BW lowered their standards by making all these fashionable, hot, or sexy clothing for our crew if they want to lounge in catsuits when not on duty fine but bra straps? Hell no not approparate for lounge wear or battle. If they want these outfits to remain part of the game why not just place them in the stores to buy?
Just label it sexy Justicare armor or sexy crimial casual and make all the males on your crew also have sexy versions for the fem players. Once bought the character will have these shown on ship or wear them into battle this compromise then allows for players to decide after they get the characters how they'll apear in their game it doesn't offend, it doesn't lower the quality of the game from the onset, and the player decides how preformance ready they are for battle and hazardous enviroments.
The standard if BW is trying to be a serious sci-fi game is to keep all crew in battle ready armor for ground missions and combat, keep a practical casual attire for on ship or in safe non combat hub worlds, if sexy attire for any crew or m/f hero is needed then give us the proper context for it sex or party (Miranda's look in the Citidel DLC for example is spot on) for where she is and what she is doing. Basically first impressions are everything here if I see a good character dressing like a stripper I'm going to think the striper took a wrong turn heading for the club instead of ally, dress them for success not failure here BW its very simple.