For me, every game (DMD era is what i use) gets LEDs in Inserts, backbox and flashers. Always - i think it looks great, and i have not had one person who saw my games saw anything negative - usually, complements. I think alot of the negative comments i read come from peoples use of LEDs years back, when they ghosted and such. Since then, the "supers" at Cointaker look incredible compared, a lead ahead.
GIs are a little different. They tend to set off a blueish white color. Every game i have ever had - i tried GI LEDs but switched back to 44s because i couldnt take it.
The ONLY game i think looks good with this - is T2 - First time i ever kept LEDs in the GI.
BSD as well, but only in select spots.
For reference - games i have owned / own and did inserts but NOT GI - SM, IM, Tron, TZ, taxi, RFM, AFM, IJ, TAF, HS2, TSPP, BSD, T2, LOTR, probably others i cant remember.