Pretty good, for the most part.>Gundam Novels
As mentioned above. I enjoyed them, though.>Confessions of a D-List Supervillain
Honestly, only read this if you're REALLY hard up for a guy in powered armor. It's like three or four different books in one and it's honestly not that great. Soulless superhero action featuring the biggest villain-turned-hero wank this side of Shocker: Legit.>Soon I Will Be Invincible
Loving pastiche/homage of superhero comics. Half the book is told from a 90s-style combat cyborg, name of Fatale, with a lot of attention paid to how her mechanics change the way she lives and sees things. The other half is told from a Silver Age-style supergenius (think a bulletproof Lex Luthor), going by Doctor Impossible, with a good bit of focus on his gadgets and backup plans.>Robotech
Say what you will about the anime, the novels are actually pretty good and lean more into the technical side of things. It's still, y'know, Robotech and not Macross, but it's a lot better than the show. They apparently released new versions with new bits edited in to tie it to that godawful Shadow Chronicles crap, so make sure you get the 90s versions.>Posleen War
Haven't actually read, but someone recommended the series to me. Military sci-fi.>Battletech
There's a bunch of novels out, and Stackpole's in particular are pretty well regarded. Lots of different kinds of mechs in lots of different fights.>X-Wing
Starfighters, not mechs, but this series is pretty good, too.