I have a 5* OML (2/1/2) that I can level to 330. I also have a 12 cover Iceman (4/5/3) and a 12 4Pool (5/4/3) that need some iso love. I am tempted to level OML as 5s are taking over but will this negatively affect who I see in PvP and who attacks me? Will I be constantly beaten down by 5 rosters? I just want an easy climb to 1,000. My mains are a 275 Hulkbuster, a 273 4hor, a 271 Kingpin and a 271 Thing. Thanks.
As you already have 4 characters above lvl 270, then your scaling isn’t going to be hurt noticeably by leveling your OML. Based on your roster, I would probably level OML first, then Iceman. Iceman is great, but OML still dominates.
OML will be quite useful as a scarecrow. 330+ is when he really starts to get scary, so you will definitely get some value out of pairing him with someone like IMHB or, eventually, iceman.