My honest opinion about Ollie is that 29 years old, scored 15 goals last season, and finished at 7th as top scorer. He's still worthy as a striker, but don't like his release clause, which is £60m. If his price can be reduced like £45m, it's worthy.
Watkins' current market value is around 34.5 million pounds. That release clause is unreal. Honestly there wouldn't be anyone to pay him that much.

I don't think even 45 million is okay for him. He is 29 already.
I think he can't be sold above his current value in the market. For example, Manchester United can't find a buyer for Rashford at 40 million now. Aston Villa also doesn't want to pay that. So they shouldn't expect Watkins to be sold for a similar amount either.
He might not be the best option but he's a worthy player since he's Premier league proven and can score a good number of goals, it's better than not signing any attacker or ending up with Rashford that's fallen out with the coach or Hodjlund that's yet to improve into the quality suited for a team like Manchester United, in a worst case scenario Manchester United can manage Watkins till they're able to qualify for the Champions League then sign a better option afterwards, maybe if they could offer 40 million to Aston Villa they could consider selling him, or they could do a swap loan deal between Watkins and Rashford if Barcelona or Bayern Munich fail to sign Rashford.