Love - Either Selhurst Park or Ninian Park.
Worst - Pick a cookie cutter new stadium, any of them. They are all grey, soulless, concrete holes that in years to come will just be grey, soulless, concrete holes.
Football fans traditionally form quite strong attachments to their home grounds and travelling fans develop strong memories from away games as a result of the stadium the visit. In years to come, when those grounds that had certain quirks and vices have gone, travelling fans will just be travelling from concrete bowl to concrete bowl with identikit seats, food and drink stands etc, with bovril and pie sold by the same retail chain as deals with half the league rather than local stuff, sold by die-hard fans from portacabins or snack counters under the stand.
Rejoicing over the coming of cut and paste football grounds is support for selling out to corporate ground sponsors and more space for exec boxes and less space for fans.