There is currently a BOGO event running, so if you buy a hero with G's, you will get another random hero as well. Scarlet witch just got her review and is totally awesome now, so buying her for 450g and getting another random hero free that would likely cost at least 900g is probably a good option.
By all means keep playing Deadpool, as I said he's not like garbage or anything. The reviews of launch heroes have by and large been quite beneficial, with the odd exception here and there. You can't please everyone, after all. Also, some of them took a little extra work later on to really get them to good place (Cap, for example.) One of the major differences is that all characters except Deadpool and the other couple un-reviewed launch heroes (Cable and Thing) don't have the same skill progression as everyone else; they stop gaining skills at 30 and don't have a signature. All other characters gain new skills all the way up to 52 when they unlock their 10min cooldown ultimate, and unlock a strong ~1m cooldown signature ability at 30.