Some companies destroyed by Electronic Arts:
Maxis - Creator of the "Sim" games (such as "The Sims", "SimCopter", and of course, "SimCity") which made quality games with attention to humor and detail. Since EA's absorbtion of this fine game maker, games are released buggy and unfinished, and are never quite properly fixed, since patches don't come out as they should.
Westwood - Creator of the Command & Conquer series of games, also obliterated by EA. Excellent titles were produced by Westwood, and came in an actually finished state. If there were problems, they were patched. Since becoming one of the many sub-names of EA, games produced under the C&C trademark have been ridiculously shoddy. One such game is Command & Conquer Generals, and its expansion, C&CG: Zero Hour. This particular title is absolutely ridden with bugs and improper code, and despite its popularity, EA refuses to release updated patches for it.